It's an SET Class Rating to be exact. Requires an approved training course and test to add the Cass Rating. The non complex SET Variants are grouped such as the Cessna SET Rating allows you to fly Andy Cessna SET and you do differences training between the variants. You can move between different non complex SET by training as required and a skill test.
Multi engine turbine is always a Type Rating.
I run loads of these on various SET classes all the time. Caravan last week and this week Dornier Type Rating Courses.