The op is asking about RCI exchanges. RCI is a timeshare company and that's what I'm assuming she's asking about. If RCI can be exchanged for RCCL cruises.
I didn't think so, as I said, since RCI isn't the same as RCI (royal vs I can't remember what RCI the timeshare company uses to stand for) though I chose not to address the parent company acronym sameness (since the OP used RCCL in the title and therefore seems to have that figured out), but then I decided to look it up. And I found that site where people can exchange RCI timeshare points into the site for cruises. (The value I leave up to her...I dislike that timeshare company personally but others feel differently)
Since I'm not a member of that site or RCI the timeshare co I can't log in and see what prices are like if you have points to exchange. And I have my limits when it comes to looking things up for people. I chose not to check the prices against Royal. Since the op is asking about it I figure she can log in to RCI at least. And she can go from there.
I do not think I answered her wrong, based on my understanding of the question about RCI exchanges.