Install version is the same of Source code version?

[Scippy]

Hi,
Installing latest OpenUrlRewriter71_01.04.04_Install.zip and all seem to work fine, host extension is opened well with http://mywebsite/host/extensions?portalid=1
After installed OpenUrlRewriter71_01.04.04_Install.zip if I open OpenUrlRewriter71_01.04.04_Source.zip and recompile the dll without any modification and all work fine except for all host menu, for example host extension is opened with url http://mywebsite/host/extensions/portalid/1 with 404 page not found.
If I replace the dll with install version all resume to work fine.
There are some difference between Installand source version? How is it possible if they have the same source code?
Could be a target framework issue? I'm compiling with target 4.5.2

[Scippy]

I've solved.
I don't know why, but if I compile with directive DNN71 all work fine.