Top end tolerance group mating color codes ????

[keleto]

On the factory official service video here https://www.youtube.com/watch?v=6ptXHE2i0x0 at time index 53m14s the mechanic says "Whenever new parts are installed make sure all components such as piston, gudgeon pin, connecting rod and small end bearing correspond with the color code shown in our mating table". This is the first I have heard of this for newer MZ s and I have never seen any advertised parts have their color codes mentioned (Although I do remember having to do that for Puch Maxi machines many years ago). What is the score ?