One key point which carrier-based AEW&C aircrafts (E-2C/D and KJ-600) excels at is their STOL capability. This is a major factor of consideration for the JASDF, which is why they operate 18x (and increasing) E-2C/Ds, versus only a meager fleet of 4x E-767s - Mainly due to the need for operating from many of their islands with only short runways available on them.
Though, when it comes to KJ-600 - Despite bearing a lot of similarities to the E-2C/D, how much do they differ from one another?
For one, given that the KJ-600 is anticipated/expected to be propelled by two WJ-10/AEP500 turboprop engines with 5000 kW of power output (which is a significant step-up over the T56-A-427A and WJ-6C’s ~3800 kW), could the KJ-600 operate from the STOBAR twins (albeit only from launch position #3)? If that's a yes, then there will be a need for at least 8 more KJ-600s.
Moreover, there's the question of whether the KJ-600 is capable of high-altitude operations in mountainous terrains. If that's also a yes, this means the KJ-600 could be deployed at the frontline airbases across the Xizang Plateau. Given that they don't need runways that are as long as land-based aircrafts, their STOL capability could come in handy for operations in high-altitude airbases where the atmosphere is thinner.
Of course, the two aforementioned points are just my inference on the matter.