I just found out that you can have a Nintendo Accont on multiple Switches. But only one of them is the primary Switch. That means that only your account can access your games on the Secondary Switch.

So my question is, if I have 2 Switches with 2 accounts (an old one, and a new one) and I played Animal Crossing from my Account on the new Switch, would I have the same island on 2 Switches?

How would that even work??? If I added a new Account to the new Switch, then there'd be a Villager that doesn't even exist on the Primary Switch...

I do not want that. I want 2 separate islands. But keep my account on both Switches.

Sorry if this doesn't make sense... I can't think of any other way to word it.

Edit:

I just remembered Island Save Data Backup. If that's not turned on, could I have 2 of the same Villagers (my old account) on 2 different Islands?

Edit edit:

If I switch my Primary Switch the Secondary Switch, would I keep that save data on my Old Switch, and have a new save data on my new Switch?