I downloaded and listened to the second set of files last night, on speakers the same way as with the first set, and was reassured to find they didn't sound very different to me at all. It was a quick listen. I was quite fatigued from a long day at a trade show and figured I should listen more closely on headphones when I was fresh, but haven't had time.
I think it highlights the necesity for multiple comps, and the need to resist the temptation to draw premature conclusions before there is enough data.