I found How to compare 2 wav files. but the thread is quite old and did not really give me any starting points.
That thread is loaded with suggestions as well as caveats; I don't think you'll do better than that on a general purpose forum like this one.
In reply to Re: comparing two sound files - percent similiar
by GotToBTru
in thread comparing two sound files - percent similiar
by slloyd
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