Not quite sure what you mean Jelmer. The colour combinations ran from dark to light, so 74 was the dark grey, 75 the medieum grey, and 76 the light, blue-grey.
Camouflage patterns were originally laid down to a strict pattern for each class of aircraft, although there could be variations in the demarcation shape peculiar to individual factories, particularly on the '109.
Differences in appearance in photographs is mainly due to the reproduction process. A perfectly exposed and printed B&W photo, printed on the correct grade paper, may well show the tones correctly. however, once this same photo has been copied, and then made into a half-tone negative for subsequent transfer to printing plates, that's when the fun, or problems, begin. there are so many possible variations in exposure, dot size, undercut and so on, that even before the image reaches the printed page, it can look totally different to the original. Add colour to this, or worse, a colourised B&W print, then reproduce this in printed form and variations can be massive.
The 74 and 75 colours had more of a blue-purple bias, from the blue or red pigment included to obtain the paint shade. If a green tint is present, then this is more likely to be RLM 02, the greenish grey which replaced RLM 70 in earlier camouflage, normally seen as a combination of RLM71, RLM 02 upper surface, and RLM65 under surface, the latter being replaced, in the main, with RLM 76.