Everything I've read says it
Everything I've read says it's the same twin scroll turbo, and the intake would be different due to it being transverse in the RS. Nothing they have said would indicate that there were physical changes in the engine it's self (like compression, internals, etc.) My guess its they put a bigger IC on it and gave it more spark advance, and fuel via a tune. Even the wikipedia article lumps the 2.3l motors into the same group.( as reliable as Wikipedia can be obviously) Judging by how you can easily get the mustang to that power level with a tune and an air filter, I'm going to assume the motors and turbos are identical.