diff --git a/pandas/core/internals/__init__.py b/pandas/core/internals/__init__.py
index f0018928255e6..af1350f088b7a 100644
--- a/pandas/core/internals/__init__.py
+++ b/pandas/core/internals/__init__.py
@@ -9,12 +9,10 @@
 )
 from pandas.core.internals.blocks import (  # io.pytables, io.packers
     Block,
-    DatetimeBlock,
     DatetimeTZBlock,
     ExtensionBlock,
     NumericBlock,
     ObjectBlock,
-    TimeDeltaBlock,
 )
 from pandas.core.internals.concat import concatenate_managers
 from pandas.core.internals.managers import (
@@ -28,11 +26,9 @@
     "Block",
     "CategoricalBlock",
     "NumericBlock",
-    "DatetimeBlock",
     "DatetimeTZBlock",
     "ExtensionBlock",
     "ObjectBlock",
-    "TimeDeltaBlock",
     "make_block",
     "DataManager",
     "ArrayManager",
diff --git a/pandas/core/internals/array_manager.py b/pandas/core/internals/array_manager.py
index 367fe04678cd8..294d1fd078b08 100644
--- a/pandas/core/internals/array_manager.py
+++ b/pandas/core/internals/array_manager.py
@@ -471,7 +471,7 @@ def apply_with_block(self: T, f, align_keys=None, swap_axis=True, **kwargs) -> T
             # error: Item "ExtensionArray" of "Union[Any, ExtensionArray]" has no
             # attribute "tz"
             if hasattr(arr, "tz") and arr.tz is None:  # type: ignore[union-attr]
-                # DatetimeArray needs to be converted to ndarray for DatetimeBlock
+                # DatetimeArray needs to be converted to ndarray for DatetimeLikeBlock
 
                 # error: Item "ExtensionArray" of "Union[Any, ExtensionArray]" has no
                 # attribute "_data"
diff --git a/pandas/core/internals/blocks.py b/pandas/core/internals/blocks.py
index 2df1b62fb8221..d1d0db913f854 100644
--- a/pandas/core/internals/blocks.py
+++ b/pandas/core/internals/blocks.py
@@ -50,7 +50,6 @@
     is_dtype_equal,
     is_extension_array_dtype,
     is_list_like,
-    is_object_dtype,
     is_sparse,
     pandas_dtype,
 )
@@ -207,13 +206,6 @@ def is_bool(self) -> bool:
     def external_values(self):
         return external_values(self.values)
 
-    @final
-    def internal_values(self):
-        """
-        The array that Series._values returns (internal values).
-        """
-        return self.values
-
     @property
     def array_values(self) -> ExtensionArray:
         """
@@ -1771,7 +1763,8 @@ def get_values(self, dtype: Optional[DtypeObj] = None) -> np.ndarray:
         return object dtype as boxed values, such as Timestamps/Timedelta
         """
         values = self.values
-        if is_object_dtype(dtype):
+        if dtype == _dtype_obj:
+            # DTA/TDA constructor and astype can handle 2D
             values = values.astype(object)
         # TODO(EA2D): reshape not needed with 2D EAs
         return np.asarray(values).reshape(self.shape)
@@ -1821,7 +1814,7 @@ def diff(self, n: int, axis: int = 0) -> List[Block]:
 
         Returns
         -------
-        A list with a new TimeDeltaBlock.
+        A list with a new Block.
 
         Notes
         -----
@@ -1869,19 +1862,16 @@ def delete(self, loc) -> None:
             pass
 
 
-class DatetimeLikeBlockMixin(NDArrayBackedExtensionBlock):
-    """Mixin class for DatetimeBlock, DatetimeTZBlock, and TimedeltaBlock."""
-
-    values: Union[DatetimeArray, TimedeltaArray]
+class DatetimeLikeBlock(NDArrayBackedExtensionBlock):
+    """Mixin class for DatetimeLikeBlock, DatetimeTZBlock."""
 
+    __slots__ = ()
     is_numeric = False
 
-
-class DatetimeBlock(DatetimeLikeBlockMixin):
-    __slots__ = ()
+    values: Union[DatetimeArray, TimedeltaArray]
 
 
-class DatetimeTZBlock(ExtensionBlock, DatetimeLikeBlockMixin):
+class DatetimeTZBlock(ExtensionBlock, DatetimeLikeBlock):
     """ implement a datetime64 block with a tz attribute """
 
     values: DatetimeArray
@@ -1890,10 +1880,12 @@ class DatetimeTZBlock(ExtensionBlock, DatetimeLikeBlockMixin):
     is_extension = True
     is_numeric = False
 
-    diff = DatetimeBlock.diff
-    where = DatetimeBlock.where
-    putmask = DatetimeLikeBlockMixin.putmask
-    fillna = DatetimeLikeBlockMixin.fillna
+    diff = NDArrayBackedExtensionBlock.diff
+    where = NDArrayBackedExtensionBlock.where
+    putmask = NDArrayBackedExtensionBlock.putmask
+    fillna = NDArrayBackedExtensionBlock.fillna
+
+    get_values = NDArrayBackedExtensionBlock.get_values
 
     # error: Incompatible types in assignment (expression has type
     # "Callable[[NDArrayBackedExtensionBlock], bool]", base class "ExtensionBlock"
@@ -1901,10 +1893,6 @@ class DatetimeTZBlock(ExtensionBlock, DatetimeLikeBlockMixin):
     is_view = NDArrayBackedExtensionBlock.is_view  # type: ignore[assignment]
 
 
-class TimeDeltaBlock(DatetimeLikeBlockMixin):
-    __slots__ = ()
-
-
 class ObjectBlock(Block):
     __slots__ = ()
     is_object = True
@@ -2022,10 +2010,8 @@ def get_block_type(values, dtype: Optional[Dtype] = None):
         # Note: need to be sure PandasArray is unwrapped before we get here
         cls = ExtensionBlock
 
-    elif kind == "M":
-        cls = DatetimeBlock
-    elif kind == "m":
-        cls = TimeDeltaBlock
+    elif kind in ["M", "m"]:
+        cls = DatetimeLikeBlock
     elif kind in ["f", "c", "i", "u", "b"]:
         cls = NumericBlock
     else:
diff --git a/pandas/core/internals/concat.py b/pandas/core/internals/concat.py
index a5c1f3985e70e..19c9b27db9f70 100644
--- a/pandas/core/internals/concat.py
+++ b/pandas/core/internals/concat.py
@@ -507,12 +507,16 @@ def _is_uniform_join_units(join_units: List[JoinUnit]) -> bool:
     _concatenate_join_units (which uses `concat_compat`).
 
     """
-    # TODO: require dtype match in addition to same type?  e.g. DatetimeTZBlock
-    #  cannot necessarily join
     return (
         # all blocks need to have the same type
         all(type(ju.block) is type(join_units[0].block) for ju in join_units)  # noqa
         and
+        # e.g. DatetimeLikeBlock can be dt64 or td64, but these are not uniform
+        all(
+            is_dtype_equal(ju.block.dtype, join_units[0].block.dtype)
+            for ju in join_units
+        )
+        and
         # no blocks that would get missing values (can lead to type upcasts)
         # unless we're an extension dtype.
         all(not ju.is_na or ju.block.is_extension for ju in join_units)
diff --git a/pandas/core/internals/managers.py b/pandas/core/internals/managers.py
index 3c8d942554575..b688f1b4fea5f 100644
--- a/pandas/core/internals/managers.py
+++ b/pandas/core/internals/managers.py
@@ -35,7 +35,6 @@
 
 from pandas.core.dtypes.cast import infer_dtype_from_scalar
 from pandas.core.dtypes.common import (
-    DT64NS_DTYPE,
     ensure_int64,
     is_dtype_equal,
     is_extension_array_dtype,
@@ -1639,7 +1638,7 @@ def external_values(self):
 
     def internal_values(self):
         """The array that Series._values returns"""
-        return self._block.internal_values()
+        return self._block.values
 
     def array_values(self):
         """The array that Series.array returns"""
@@ -1794,17 +1793,11 @@ def _form_blocks(
         )
         blocks.extend(numeric_blocks)
 
-    if len(items_dict["TimeDeltaBlock"]):
-        timedelta_blocks = _multi_blockify(
-            items_dict["TimeDeltaBlock"], consolidate=consolidate
+    if len(items_dict["DatetimeLikeBlock"]):
+        dtlike_blocks = _multi_blockify(
+            items_dict["DatetimeLikeBlock"], consolidate=consolidate
         )
-        blocks.extend(timedelta_blocks)
-
-    if len(items_dict["DatetimeBlock"]):
-        datetime_blocks = _simple_blockify(
-            items_dict["DatetimeBlock"], DT64NS_DTYPE, consolidate=consolidate
-        )
-        blocks.extend(datetime_blocks)
+        blocks.extend(dtlike_blocks)
 
     if len(items_dict["DatetimeTZBlock"]):
         dttz_blocks = [
diff --git a/pandas/tests/frame/methods/test_quantile.py b/pandas/tests/frame/methods/test_quantile.py
index bc1d4605e985a..dbb5cb357de47 100644
--- a/pandas/tests/frame/methods/test_quantile.py
+++ b/pandas/tests/frame/methods/test_quantile.py
@@ -336,7 +336,7 @@ def test_quantile_box(self):
         )
         tm.assert_frame_equal(res, exp)
 
-        # DatetimeBlock may be consolidated and contain NaT in different loc
+        # DatetimeLikeBlock may be consolidated and contain NaT in different loc
         df = DataFrame(
             {
                 "A": [
diff --git a/pandas/tests/internals/test_api.py b/pandas/tests/internals/test_api.py
index 60fbd2da70e79..0062d5aa34319 100644
--- a/pandas/tests/internals/test_api.py
+++ b/pandas/tests/internals/test_api.py
@@ -27,11 +27,9 @@ def test_namespace():
     expected = [
         "Block",
         "NumericBlock",
-        "DatetimeBlock",
         "DatetimeTZBlock",
         "ExtensionBlock",
         "ObjectBlock",
-        "TimeDeltaBlock",
         "make_block",
         "DataManager",
         "ArrayManager",
diff --git a/pandas/tests/series/methods/test_dropna.py b/pandas/tests/series/methods/test_dropna.py
index 1c7c52d228cfa..5bff7306fac33 100644
--- a/pandas/tests/series/methods/test_dropna.py
+++ b/pandas/tests/series/methods/test_dropna.py
@@ -70,7 +70,7 @@ def test_dropna_period_dtype(self):
         tm.assert_series_equal(result, expected)
 
     def test_datetime64_tz_dropna(self):
-        # DatetimeBlock
+        # DatetimeLikeBlock
         ser = Series(
             [
                 Timestamp("2011-01-01 10:00"),
@@ -85,7 +85,7 @@ def test_datetime64_tz_dropna(self):
         )
         tm.assert_series_equal(result, expected)
 
-        # DatetimeBlockTZ
+        # DatetimeTZBlock
         idx = DatetimeIndex(
             ["2011-01-01 10:00", NaT, "2011-01-03 10:00", NaT], tz="Asia/Tokyo"
         )
diff --git a/pandas/tests/series/methods/test_fillna.py b/pandas/tests/series/methods/test_fillna.py
index cf6b357d0a418..51864df915f8c 100644
--- a/pandas/tests/series/methods/test_fillna.py
+++ b/pandas/tests/series/methods/test_fillna.py
@@ -334,7 +334,7 @@ def test_datetime64_fillna(self):
 
     @pytest.mark.parametrize("tz", ["US/Eastern", "Asia/Tokyo"])
     def test_datetime64_tz_fillna(self, tz):
-        # DatetimeBlock
+        # DatetimeLikeBlock
         ser = Series(
             [
                 Timestamp("2011-01-01 10:00"),
@@ -414,7 +414,7 @@ def test_datetime64_tz_fillna(self, tz):
         tm.assert_series_equal(expected, result)
         tm.assert_series_equal(isna(ser), null_loc)
 
-        # DatetimeBlockTZ
+        # DatetimeTZBlock
         idx = DatetimeIndex(["2011-01-01 10:00", NaT, "2011-01-03 10:00", NaT], tz=tz)
         ser = Series(idx)
         assert ser.dtype == f"datetime64[ns, {tz}]"