It is the same design but no one is absolutely sure it's a RRA assembly. I replaced the 2 stage trigger in my PC 15-22 with a single stage CMC trigger and have never looked back.
The RRA hammer that broke in my AR22 (CMMG upper with Aero Precision lower) snapped, it wasn't a sheer type break. Could have been a heat treating issue. (just a guess) Maybe I'll try the PC 2 stage trigger in my AR22, worst that can happen is it fails like the RRA did.