Tough for me to compare with such short samples and different portions of songs for each, but a fun exercise nonetheless. I'm not at all familiar with the mics and / or recorder, or the music (which I definitely like it), which makes it even more challenging. Here's my stab:
1st Set: A / D one source, B / C the other. I had the toughest time placing B, in part due to the lack of vocals which the other clips all included.
2nd Set: E / G one source, F / H the other.
B/C/E/G sounds like it has a deeper sense of space, more detailed, warmer / fuzzier bass, and levels a bit stronger on the R side. A/D/F/H sounds like it has less depth / sense of space than the other, less detail, but punchier and a little more up front, with levels better balanced.
Then again, if I have my sample selection all screwed up, then they all sound different and / or the same.
Thanks for the comp!