Much of the fuel savings on the B787 is do to the fact that bleed air
from the engines will be used only for thrust.

Not entirely accurate, as the GEnx engines on 787 do not have bleed
air. All engine power goes to thrust. (I know...semantics) The GEnx
will have some pretty stout generators though, to power all the things
normally accomplished by bleed air from the compressor.

The GEnx engines will also be on the A350 but plumbed for bleed air.
Ditto for the 747 Advanced (if it ever gets built).

Airbus says there's only 10% commanality in parts numbers between A330
and A350.