it is allowed. But, it's not really a good thing to do, because DL tix are alot cheaper than WDW tix. If you have valid WDW tix, and you are SURE that you will not EVER be going back to WDW, then use them. If you are going back to WDW, it is better $ wise to save the WDW tix for WDW, and buy DLR tix for DLR. You cannot use DLR tix at WDW because of this.... Disney is smart!!!