Comparing these two photos, oxygen/air supply tubes are plugged into the workstation panel of KJ-2000. There is no such configurations in KJ-200. However, losing pressure is always a consideration for a combat aircraft. So does it means the KJ-200 photo was taken in a simulator?
I'm pretty sure it is real. Is it normal for each console in an AEWC or other aircraft to have a dedicated back up oxygen supply?
A quick search of other platforms like E-3, 737 wedgetail, do not show obvious back up oxygen tubes either. Frankly I'm not even sure the tubes in the KJ-2000s consoles are for oxygen.