Rolex

I had the caseback of my SS Daytona engraved when I purchased it brand new. Now the engraving no longer serves any meaning to me and I would like to replace it with a new caseback. Since I will be visiting Hong Kong in two weeks and was wondering if I can... 

but you will probably not be able to keep the old caseback. -Rick

does the caseback have markings to identify it as the original one for the watch? if it doesn't, then no big deal, otherwise, it won't match correct?