Hi everyone, for anyone that has multiple versions of New Leaf, is it ok if I use multiple cartridges on one 3DS even though it'll have the same friend code? Now that New Leaf is going to be only $20 and with the awesome update coming, I'm considering getting a new game. Would playing on one 3DS screw things up? Thank you!
Yes, there will be no problem, because ACNL saves to the cartridge, not to the sd card (unless you have a digital copy). Even if you have a digital copy, you still can use cartridge game on the same ds as the save for the cartridge version will be read from it and for the digital version will be read from the sd card.
It works fine for me, as the others have said, it doesn't save your town data to the 3ds, it saves it to the cartridge in question. Streetpass also seems to work with whatever cartridge is in at the time when I tested it. I haven't ever put up a house for display though, so I can't speak for how that will work.