I'm sure I used the device link feature this time. I've got the same friend code on both devices A8269YBB , the same friends on my list, but different avatars and different stats.
I'd delete the old profiles if I knew a way to get to them but I think they are long gone after deleting the app and formatting the iPad. The old profiles only linger on as ghosts on other people's friends list. Maybe not ghosts, perhaps clones that have gone rogue would be more in fitting with the theme.