The first image is a close-up of the KJ-500's radome, and the second is a close-up of the KJ-500A's radome—you can clearly see the distinct differences in their structure:
The first image is a close-up of the KJ-500's radome, and the second is a close-up of the KJ-500A's radome—you can clearly see the distinct differences in their structure: View attachment 162058 View attachment 162057