Well swh, you got me there. I read that the NEO engines would be substantially heavier than the CEO on another website. I cheated by verifying a Wikipedia. I can't say that delving into EASA documents ever crossed my mind. My apologies.
There is still just one problem though. The Trent 1000 is a bleedless engine architecture. The Trent 7000 will not be. You think there might just be some extra weight (and drag and lost efficiency) in there? I do. Just another crazy thought from Clueless Redneck.
You still haven't addressed A330NEO / A350 canabalization... Or that heavy 1970s fuselage... Or that old 1990s wing and empennage...
The ONLY ways the A330NEO competes with the 787 (or A350 for that matter) is by being cheaper and more readily available. It will be effective at that, against both airplanes, as a second tier option for second tier airlines.
The A330NEO will be like the 767-400. It was a valiant effort, but in the end just outclassed by a more advanced design.