Common files produced by data assist, are they different?

helperphp.php
wa_appbuilder_php.php
jquery-blockui-formprocessing.js

These files seem to be consistently created when running data assist, and I am wondering if each time data assist is run, is it creating different code suited to the pages, or is it stock code that can be used in all other data assist created pages/applications? I've looked, and on the face of it, it seems to be the same.

If they are stock code and the same across the board, are there any other files that are common in other instances? Is there a definitive list available?

I'm asking this because I am consistently finding myself building identical pages from one website to another, and I have started to build small modules now which I pick up and place into larger projects. Modules such as user registration and log in, navigation system, SEO, news, events, and so on, but each time I drop one of these modules in place, something in the forms seem to break - primarily form validation and how the failed validation always remains visible once the module is added to another site.

Thanks.