RR = reduced resolution, a figure with a less detailed mesh but the same overall shape as the full version. Since morphs are absolutely dependent on the mesh vertices (the points that define the shape) and their order morphs don't transfer between the reduced resolution figure and the full version (currently SR2, service release 2). And yes, that applies to V3 RR vs V3 SAE (the current full version) too, but you can still get a bundle of free DAZ figures from download.com so you won't have to buy the V3 base figure.