Your better off to wait till the actually issue the FCC then rebook. If you deposit
you will only get a credit for future cruise not an actual onboard credit so it can’t be used except to deposit on another cruise. My agent was able to call RCCL and
reserve my cabin on my new cruise and when we are emailed the FCC from RCCL she will complete the booking. It’s my understanding the will refund back taxes from original booking so taxes will have to be paid on the new booking. Hope this helps and if anyone with more knowledge has info I welcome that as well. The knowledge of this group has made unsettling times a bit better for me.