Good luck using your lift and shift RCI have altered all cruises so they dont match any offered under the L&S as their terms and conditios state that it must be the same itinerary and duration.
I tried to book a 9 night cruise same area 1 night less ( booked for a 10 night cruise with 1 extra port) they said no because it doesnt match like for like
so i checked several other cruises and there was not one that matched a 20/21 sailinign with a 21/22