Does going from a gamecenter account to another allow you to have more than 1 save file on the same device? Since deleting the app makes you lose your whole file, I pretty much guess it’s not the case but you never know wanted to make sure.
No you can’t switch account to have a second game on the same device.
but you can have multiple acount in one device,if your phone have “USERS” you can create multiple user in one device