Spectrum Data Comparison By Percent

Is it possible to compare two audio clips and have a GUI or UI text read out the difference in percent to determine audio difference. I guess a better way to explain what I need would be to determine if two audio samples were from the same person. Is such a thing possible? Does not have to be super complex.

UPDATE! I see that Unity produces all kinds of spectrum data so my thought is that there should be a relatively simple way do do some basic audio comparisons..... Anyone!!