Good topic. Finding it very difficult to tell them apart.
In daylight in front of me, I find them easy to distinguish, having seen both previously.
In pictures it is very difficult because the ambient lighting influences what your camera records. That 50% gray patch seems added on your computer and can only be used to calibrate anything later, not the original colors. For example, I detect a color bias in that patch.
Take pictures in daylight, out of the direct sun, but without clouds and with a neutral gray in view of the camera.
Or open a handset and show the inside right next to the housing. Using the inside of the housing is useful too, but you can't show both inside and out at the same time.
A date-matched set with a 64 color code on the dial is probably the real deal. Look at the date dial impressions molded into the housing and the handset for year of manufacture.