I didn't know what I was listening to when I first heard it, but my very first response was that it was the same voice, and that my computer had messed up and was overlapping the voices.

But after figuring out what it was all about, I could separate the voices. One is lower, and one is higher. But that's pretty easy to change. I mean, I can make my voice sound like a 9 year old, so this could easily be the same person, just speaking differently.

But I certainly can't tell for sure. I could honestly go either way on it. I'm not sure if that "proof" is good enough.