Once upon a time I used to teach the ASA Cat course. There are some differences, all can be sorted in a day, if I was in the islands I would show you the ropes. Like monohulls there are good cats and bad ones, but unlike 30 years ago, most are good cats. Avoid the cats with far aft steering as you will have no bow visibility.

Items to address:
The main is a lot harder to raise as it is a double purchase
Anchoring as the the boat will swing differently, setting a bridal is very important
Tacking is a bit different, not always needed, but sometimes it helps to back wind the jib for a second.
When tacking you need to pay attention to your jib sheets they can can caught on the mast
Motoring on 2 engines is a piece of cake. We used to practice at Leverick Bay or Sydneys at JVD. Grabbing a mooring is so much easier, you just need to play with your engines a bit to know how the boat reacts. A cat will quickly stop dead in the water a monohull will glide for a while.