@ BillS
Negative,
3 engines are in use:
1) Engine Alliance (EA) GP7270 used by Emirates & Air France
2) Rolls-Royce Trent 970/B used by Singapore Airlines & Lufthansa
3) Rolls-Royce Trent 972/B used by Qantas
Korean has the EA on order and Malaysian the Trent 970.
The Trent 972 is a slightly powerfull version of the Trent 970
From post #217. So yes it does appear that QANTAS use a different model of the Trent 900. Maybe significant, maybe not.