Sometimes last year I ordered 3 copies of this keyboard on ebay. IIRC HaaTa also bought one. I have taken a few potato pictures of their differences.
The keyboards are as following:
The gerkonic(?) hall effect keyboard:
and the BUD/Honeywell hall effect keypad:
Keycaps:
Grey keycap is from the honeywell, red keycap is from the gerkonic keyboard.
The main difference is obviously the size. The gerkonic keys are a tiny bit wider, whilst the honeywell key is smaller but more robust.
Obvious difference lies in the material and build. The Gerkonic key feels more like Abs whilst the honeywell key is a massive chunk of PBT.
Switches:
Gerkonic:
Honeywell:
The key mount on the gerkonic is a single rectangular block whilst the key mount on the honeywell is a cross.
Another difference seems to be that the honeywell is either closed/internal(see pictures of gerkonics springs).
Both switches are super linear(as is to be expected from hall effect switches), but the honeywell switches seem smoother, i believe that this is a placebo caused by their sound.
I also don't have any pictures from when i opened the gerkonic switches, but there seems to be a small hatch that opens once you actuate them, i believe that the springs are only there so that the switch can pop back to place after actuation
Space bar:
Two dummy switches and a wire. I really love this efficient industrial sovet-style design.
Comparasion video:
https://youtu.be/jWq3fJRGs58
.