I have flown both drones. I have not noticed any difference in flight stability. As far as image quality, there are a few improvements in the Mini 4 Pro, mostly software related but nothing major. I never used my Mini 3 Pro or my current Mini 4...
According to the specs the NEO is not compatible.
Supported Aircraft Models
DJI Mavic 4 Pro, DJI Mini 5 Pro, DJI Mini 4 Pro, DJI Air 3S, DJI Air 3
Chris
Here's a VR Pano shot with the 70mm lens on the Mavic 3 Pro that shows the area where the other shots were taken and the stage of the fall colours so far.
Chris