My initial search was insufficient and I think I've found a much-more direct answer to the question in this Apr 23 2023 tweet by Rhin0 / @SpaceRhino0 which states
- R25,R28,R29,R34,R41,R44,R46,R47,R51,R53,R61,R63,R68,R70,R82,R84,R85,R97,R100 (RB's) and R26,R72,R75,R79,R83,R88,R95,R99,R102,R104,R105 (RC's) Destroyed on B7
- R55,R78 (RC's) and R115 (RVAC) Destroyed on S24
- R143, R145 and R183 spotted on B9
For B7, 19 RBs and 11 RCs are listed, so that's not quite all the engines accounted for, but I think it holds that the RBs constitute the outer ring on B7, as you'd expect from the layout of gimbaling and non-gimbaling engines given by e.g. the Everyday Astronaut page on Starship/SuperHeavy's orbital test.
I've yet to find SpaceX sources using the terms "Raptor Boost" and "Raptor Center" but, taken with the appropriate grains of salt, the community/communities watching Starbase are providing good open-source intelligence (OSINT) and I'm willing to treat them as reliable. I think I'll have an answer to your other question about the differences (as far as the community knows / is classifying them) soon from the NASASpaceflight.com forums.