No you will not lose them. Dining reservations are not linked to your resort. This is why people who cancel their trips are reminded that they will also have to cancel any reservations they may have made (dining, BBB, tours, etc).
Nope, you will not lose them. I just had my waitlist go through and I switched my resort from Jambo House to Kidani Village. All my dining reservations are still here.
If you call and have a CM change it, you will not even have a different reservation number. I have changed mine several times for an upcoming trip and still have the same confirmation and all the adrs?