Since Oriel is already detuned (assuming for model segmentation reasons), detuning RS wouldn't make sense.
Since Atlas clearly didn't give revised L15B (180 hp / 240 nm) variant that's introduced internationally, I see no logical reason why they wouldn't maintain the same output from same L15B as outgoing Civic RS.
If they detune XI RS compared to X RS, then they not only lose its USP but it also means somewhere something is still not right with X RS wrt to our local fuel.
IMO if X RS runs fine on normal fuel, then engine output of XI RS should atleast be same.