The Differences
Is the Y-8 really that big ???
The Differences
Another Good Guess Party Started-Your Guess Is As Good As mine.
Pretty sure that's from a KJ-2000 parked behind the airliner. The two lengths of metal that's supposed to connect the radome to the plane isn't even orientated correctly.
The Issue Here, KJ-2000 or Something New?
Regarding the colour of the radomes I would say it is more likely the modified Y-8AEW with its new KL-2000-like arrangement.
If this is the case, it would be the rumored KJ-320.