Color-code of connectors on different cartridges.

Could anyone explain why cartridges have different positions of the color-code connectors on the back?
I own the following:
(I am presuming, tops being the positives and bottoms being the negatives.)

ZYX Airy 1000 (on TNT 5)
Looking from front of cartridge, it has:
Left: White (+), Blue (-); Right: Red (+), Green (-).

Benz Glider (M2) (new, not mounted)
Looking from front of cartridge, it has:
Left: Red (+), Green (-); Right: White (+), Blue (-).

Goldring Eroica (H) (on MMF-7)
Looking from front of cartridge, it has:
Left: White (+), Blue (-); Right: Green (+), Red (-).

The Goldring, in particular, I find strange with green on the right/top position! (Is this really correct?)

Are all cartridges mounted on the arms with the color scheme exhibited on the cartridge or are they mounted in a “set” color pattern, no matter what colors are on the cartridge itself?

Thank you for your consideration of a rather confusing situation.