Your C&A points do not follow you to Celebrity. You get reciprocal benefits at some tier levels. The points stay separate. You will have zero points if you never cruised on Celebrity but if you are for example Diamond on Royal Caribbean you will get their Elite Benifits. Points earned on Celebrity will not add to Royal points. Royal points do not add to Celebrity points. Royal's loyalty program is better than Celebrity's, you won't get the same benefits but on the other hand Celebrity is a somewhat better cruise line.