I've googled this but haven't been able to get a clear answer. I bought another physical copy of ACNL and am wondering if I can use the same SD card and 3DS that I've been using for my original copy (and not have the data from my original copy get deleted). The only thing I can find online is that you can't have two DIGITAL copies because digital copies save to SD cards. I read that you can have 2 physical carts, but what's unclear is if, in addition, I need another SD card. Thanks!
You don't need another SD card. Only digital copies of ACNL store data on the SD card. You can have as many physical copies as you want on however many DS's.











