No, you can set up your own computer synchronization. Choose "Computer syncs with ipad" or "ipad syncs with computer". As long as your payment method remains the same, changing your account will not delete your app. I used to change accounts between China and the United States. No problem, feel free to use it. Even if you can't find your things, you can still find them in the shopping, which you downloaded. You can download it again, or you can back up things on the ipad to icloud, something similar to a network disk. In the future, if your ipad is updated or has problems, just go to icloud and download it to the iPad again!