we have booked to go to the allstars in may (there were 6 of us so we went with the allstars as good for everyone).we have only so far paid the deposit, the rest to be paid in feb, can we change our booking to pop instead? its the sme price, we have stayed in all the all stars before, and havent yet done the pop resort. is it possible? can we change when we get to the resort to check in?