Yes, you can enjoy the benefits of your PRO or ULTIMATE plan with any OBDeleven device. Access to these features is associated with your OBDeleven account, not a specific device. So, all you have to do is to log in to the same account on the OBDeleven VAG or OBDeleven apps.
If you lose your OBDeleven device, you can buy a new one and continue using your existing account with the active PRO or ULTIMATE plan without needing to buy a new plan.