hehehe good question. But I think it might make a difference.
Between my 700N and 700E, the difference is only a couple 100 grams and still, it's like night-and-day:
the 700N flies like a wannabe-3D heli.
The 700E handles more like a brick with a propeller
at least I have become quite reluctant to buy CNC upgrades that are heavier than the original parts.