Just fyi - I did manage to pull out my small backcard bin, and I did check the Collection 2 backcard. There are three outfits on there: Royal Pony, Roller Skating, and Sweet Dreams(the one with the curlers - not the bedtime outfit with the cape). I did take new pictures of both sides of the card, but it might take a little while for me to process and upload them. I'm kind of in the middle of a whole collection photographing...thing.
The back of the Roller Skating outfit card I have is pretty much identical to the Collection 2 Royal Pony outfit back. If I get the chance, I'll pull out the very buried MOC bin and see if I can piece together the dividing lines of all the collections sometime soon. I'm *pretty* sure I have at least one labeled card from each collection. I remember thinking that I had all the information to figure it out, but I just never got around to it. I need to do it anyway for my collection organizing.