That will depend on the cruise line. Ask your TA (or the cruise line, if you booked direct) what RCCL's procedures are for your particular cruises. I've known others who did not have to disembark as they were staying in the same cabin, but that was on a different cruise line, and was several years ago. They also did not know until partway through their first cruise if they were staying in the same cabin or would have to change.
If you do have to disembark you will likely have to pack up and take everything with you.