Imagemagick works on 7.3, but not on 7.2

[MarkVaughn]

I've installed imagemagick php and php@7.2

switch-php 7.3
PHP switched ✔

You are now using PHP 7.3.4

switch-php 7.2      
PHP switched ✔
PHP Warning:  PHP Startup: Unable to load dynamic library 'imagick.so' (tried: /usr/local/lib/php/pecl/20170718/imagick.so (dlopen(/usr/local/lib/php/pecl/20170718/imagick.so, 9): image not found), /usr/local/lib/php/pecl/20170718/imagick.so.so (dlopen(/usr/local/lib/php/pecl/20170718/imagick.so.so, 9): image not found)) in Unknown on line 0

You are now using PHP 
Warning: PHP Startup: Unable to load dynamic library 'imagick.so' (tried: /usr/local/lib/php/pecl/20170718/imagick.so (dlopen(/usr/local/lib/php/pecl/20170718/imagick.so, 9): image not found), /usr/local/lib/php/pecl/20170718/imagick.so.so (dlopen(/usr/local/lib/php/pecl/20170718/imagick.so.so, 9): image not found)) in Unknown on line 0
7.2.17

How do I have imagemagick work for both 7.3 and 7.2