I'm writing a web application in a proprietary server page framework provided by a large business software vendor. They give you a suite of standard stylesheets for their own applications, and we've tinkered with these to make them fit the requirements for our new application.

The client has recently upgraded to a new version of the software and the standard CSS files have completely changed (as in the file has been completely re-ordered and reformatted). Looking at the end results in a browser, not a lot has changed between the two versions, but it's impossible to tell which styles are new/changed using a standard diff or Beyond Compare comparison, since the files look nothing alike.

Is there a CSS comparison tool out there that actually parses CSS files and can tell you the differences between the style declarations in different files?