Note that if your non-admin app, or main app, allows some kind of editing on a given sheet. And you want your admin’s to have access to edit more columns than a regular user of that same sheet. You would have to have two apps. That is because you can only have one edit screen, or add screen for that matter, for any given sheet. I hope that makes sense.
Also if you present your use case for the need for two apps because of this limitation, Glide will consider giving you a second Pro license for free, as long as it is pointing to the same spreadsheet.