I can confirm that all of your dine reservations are booked through another system and are in no way connected to your room reservation. Also as other have said, there is no need to call to change or modify any dine reservations due to a room reservation change.
When you book dining, we do ask:
Where are you staying, when do you check in? This is for the vert rare occasion we need to contact you should the restaurant not be able to honor your dine reservation. Even if you modified your room reservation and change resorts, we will be able to still locate you, so no need to worry.
Are you on a vacation package that includes dining? This is simply to ensure that the restaurant you choose is participating on your meal plan, and to inform you of any policies pertaining to your plan (i.e., if the location is a signature restaurant requiring 2 meal entitlements, etc.) and if the location requires a credit card deposit or guarantee, we can charge your credit card correctly.
Are you part of a Grand Gathering? This is to link your dine reservation to your pre-printed itinerary, a free perk of being part of a Grand Gathering. Again, this does not connect your dining to your room reservation, only to your printed itinerary.
May I have your room reservation number? This should only be asked if you are booking your dining more then 180 days in advance and we need to verify you qualify for the 180 day plus 10 booking window (i.e. Disney Resort Guests may start booking their dining 180 days prior to their resort arrival date, up to the first 10 days of their stay; non-resort Guests can only book 180 days prior to the date they wish to dine.)