There's not really much difference, so I don't really see much advantage. It's nicer, but it's not like the jump from classic 767 or 747 cabins to newer 777 style.
I like the nex-gen A330 cabin, particularly the newer lavatory, but I don't think it would justify the expense. I certainly prefer to fly on the newer one, but only because it looks a little more pleasant- there's no functional difference.
Granted, that's just opinion.
Anyhow it's doubtful that there would be any different technical specs. If you look at the designs, all you're really got is new overhead bin doors- the bins themselves are the same.
And lavatories are modular, they can just be yanked out any time.