Yes, I use a 65mm and 180 RB on my RZ. You just have to set the time on the lens instead of the body and B/T is a little different (lens stays open until you advance the shuttter), but they work fine.
Just curious, as I also eye RB lenses for my RZ: wasn't there something with an adapter needed to compensate for the different registration distance of some of these lenses? Don't quote me on that but I vaguely remember having read something about that recently.