You are *meant* to have the disney reference number, but you will probably not get it from TCD. When you call tell them when you arrive and if they ask for the ref tell you you have the TA one, but not the disney one, Most CM's will go ahead and let you make the booking with the 180+10. If they don't just call back and then next one probably will.
If it is less than the 180 days, then you don't need it.