I believe mechanically they are the same, and most specs are the same from the software.
The only difference is in the quality of the video recording which is a software issue, everything else is identical.
Professional:
UHD: 4096x2160p 24/25, 3840x2160p 24/25/30
FHD: 1920x1080p 24/25/30/48/50/60
HD: 1280x720p 24/25/30/48/50/60
Advanced:
2.7K: 2704 x1520p 24/25/30 (29.97)
FHD: 1920x1080p 24/25/30/48/50/60
HD: 1280x720p 24/25/30/48/50/60
Even so, he is looking at a possible cable/connection problem but also needs to be aware that the USB connector/cable between the Display and the RC can also cause video issues.
I notice that your gimbal is hard mounted to the frame with cable ties?? NOT a good idea, get the proper anti shock mountings, they're cheap enough.
Cut the cable ties and drop the gimbal off the mount and have a proper look at the cable.