Their website lists 3 different Catalina: Destination, Santara, and Deluxe. A destination trailer is probably built more for long term placement and not really intended to be moved around very much. destination style campers may not have holding tanks for instance.
As for the "Deluxe" series I think the main difference is in features offered and possible differnces in construction/materials. Check the specifications on the website carefully. If you can - find a RV dealer or show so you can see for yourself. I was frustrated as well because I also saw what appeared to be the same camper listed at some dealers as Deluxe and some just as Catalina when they were clearly the exact same camper.
I looked at the Deluxe series last year while we were researching and ended up going with our Starcraft mainly because we wanted a specific floorplan and outside kitchen layout. The Catalina Deluxe Edition and Jayco Jayflight were also close to the top of my list.