As others have said, I would call to see if there is anything that Guest Services can do for you, but generally, no they do not allow for exchanges between DLR and WDW tickets. The DLR and WDW ticketing systems are independent and you cannot use WDW tickets at DLR (or vice-a-versa); they used to allow this, but it ended several years ago. So you can call and hope for the best, but be prepared to be told that they cannot do anything.