Trent 900 - a number of versions
The difference between the Trent 970 and 972 is of note.
Nonetheless, it seems RR has certificated other versions of the Trent 900 that offer even more thrust. Those engines are presumably aimed at future versions of the A380.
Does seem to imply that the Trent 900 design should be robust enough to cope with whatever Qantas is doing with it.