Tool to parse and compare two CSS stylesheets

Question

Can someone recommend a useful program that can compare and parse two CSS stylesheets to determine whether selectors have different styles?

Due to the layout differences between the two CSS files, I am unable to utilize a typical diff-like tool. To find selectors that genuinely have different styles in the two stylesheets, I need a tool that can parse and comprehend the CSS.

The CSS Comparer from Alan Hart is the only tool I've seen, however, it gets confused when styles are applied to several selectors.