The A330s that go to NRT are the -300s, although -200s are occasionally used.
However only the -200s can be used over the Pacific, which means the -300s might take over some -200 routes (like Shanghai?) or more likely the excess capacity might end up going to Manila (or even Honolulu) to replace the 767.
Perth-Tokyo is still a 767 so could also be a potential recipient of the extra A330 capacity.