I don't meant to be the one that points out the obvious, but i think our mate is talking about whole cars... not just engines. maybe try reading the thread before posting.
I am also interested in a comparo between the two cars, i hear the jap spec is slightly more powerful (something to do with different intake, exaust, or cams timing???) but it's speed limited to 180km/h. the aussie on isn't and the instrument cluster reflects that (jap spec 180, aus spec 240) feel free to correct me if i'm wrong anyone.