The 767RR (ACE) only operates domestic routes because of the galleys - they can't operate long haul flights.
The only reason I could see Long Haul operating a Rolls Royce is if it was subbed for an A330 on a PER-SYD/MEL or MEL-SYD/SYD-MEL pattern that was part of a long haul trip
The aircraft are really unpopular amongst domestic crew and I believe they find it quite a challenge to work on at times - I'm not sure how Long Haul would find an RR on a short SYD-MEL flight!
Obviously the GEs are operated by Long Haul crew on SYD-HNL and PER-NRT but they're a very different aircraft in terms of cabin layout and galleys - the QF seat maps show this