How-to compare two (or more) INI files?

Here is an answer from serverfault.

https://serverfault.com/questions/28194/is-there-a-tool-to-compare-values-in-ini-files

Try IniCompare

Or have a look at this list of Ini editors/compare tools, though a differencing tool would be the easiest probably

You may use a comparison tool for that, like Winmerge, an open source and free differencing tool for Windows. It shows the two files side-by-side, colormarking the differences.

Supports Microsoft Windows 98/2000/XP/2003/Vista/7.