A few days ago I bought Fantasy Life for my girlfriend, and I tried it a couple of times, and I also like it very much. I simply love it actually, and want to have my own cartridge, so that we can play together. However, I would like to continue with my own save game. I noticed that each other save games are not shown on our own 3DS-systems (we both have our own 3DS), so I assume something is stored on your internal SD-card, but I am not sure if there is a check if you are running from the same cartridge.
Can I just continue with my save game when I buy a new Fantasy Life game (digital or cartridge)?