When a plugin or theme is updated, do you have a documentation...?

When a plugin or theme is updated, do you have a documentation for the list of where exactly these changes are done within the plugin or theme?

For Example: Ultimate Branding
From version 1.1.6.1 to version 1.1.7
Changelog: added new module...
This is the example I'm asking:
Files Change (just an example):
ultimate branding/classes/ubpublic.php
and so forth.
The reason I'm asking is that if for example we have changed some things within the plugin to personalized it, it will be easier to find the files we need to check if our changes will get affected. This is especially important when it comes to themes.

Thank you.