Question about AC Pocket Camp

[Sunstrider]

I think your Nintendo Account will handle the saves for the game, so if they are both using the same Nintendo Account then I guess they are synced, have you tried downloading it and play it on the new phone? I actually made an Australian apple account just to download it when it released first in Australia but I did not bother to play it through as someone mentioned you need to have your Nintendo Account logged in if you want to save all your progress. Not sure how this works now as I got bored anyway XD.