I searched for this and probably missed it so I apologize if this is a repeat. We will be at WDW in late October and have free dining. Can we upgrade to Deluxe Dining? If we were to upgrade to the Deluxe dining plan would you have to pay the full cost or just the difference between the regular dining plan and the deluxe? We have quite a few ADRs that we were planning to pay for OOP but as I crunch the numbers we may be better off upgrading (if we only have pay the difference) Thanks in advance.