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The plenums are exactly the same arent they??:S The inlet manifolds come in variations between the ph2s (RS/non RS), but i thought the plenum part was identical..
im sure the only difference is on the underside you got that big sort of breatherhole you have that on a 172 and not on a 182 i got a 182 head on mine with a 172 plenum and theres no where for that breather to go but other than that its fits fine
Both are different, however, some late 172's came with the lates design, which also includes a different cam cover. You can tell by where the canister pugs, in the older design this goes right into the head, while in the "new" ones (all 182's) they plug into the plenum.