A lot of MERP books do have RM stats, but it seems to be a little scattered with regards to which version they’re supporting. That makes sense, given that MERP was around for a long time, and RM versions evolved, etc.
What I’m less certain about is whether there are any noteworthy concerns about using e.g. RMSS stats in an RM2 game. Hands of the Healer for instance is tri-statted for MERP, LOR and RMSS.
I never read RMSS, but I always understood that it differed from the other editions in power levels. If that’s the case, and MERP power levels remains the same throughout its run, while switching between RM2 and RMSS, presumably something’s off somewhere?
I assume this is overthinking it, but I mean... it’s Rolemaster.
Anyway, re. RM stat blocks in general, from perusing MERP books, many of them do seem to consider the MERP stat blocks to be directly transferable to RM, which is great. I’ve previously run a Call of Cthulhu game in Trail of Cthulhu, and it ended up being a pain in the ass to constantly consider the (massive) differences between the two systems, and while I’d love to move to RM (in part to use War Law!) I’m not interested in extra work between sessions doing transmorphing prep work!