I don't really know how to ask this question. Anyways, I'm fairly new to Nintendo Switch and its whole online and account stuff. So, I have 2 Switches, a regular switch (my younger brother's) and a lite switch (mine). I bought a downloadable Animal Crossing New Horizons card because they sold out of physical copy and downloaded it on my switch lite and started playing the game for a few days. About 2 days ago, I bought another downloadable Animal Crossing New Horizons card and downloaded it onto my brother's switch, there was a error because our switches are linked but I just ended up re-downloading the game on my brother's switch (wasting my money but that isn't my main concern and I still have the activation that is unused). We are able to somehow play at the same time on different console but different users. But the main concern is...
When we tried to visit each other's island, we get a error that says downloaded software cannot be played on 2 console at the same time, something like that. Is it possible to transfer my brother's saved data to a physical copy of the game? Or, if he deletes the animal crossing off his switch and we buy a physical copy, will he be able to pick up where he left off? Also, will we be able to visit each other's island if we do this?