Colour anomalies in Sentinel 2A products

[marpet]

Yes, it is very likely that the different display is cause by a different distribution of bright and dark pixels in the histogram.
Unfortunately, the images are scene specific and can not easily be compared.
Good constant value ranges for the RGB images are
Red: 0 - 0.35
Green: 0 - 0.30
Blue: 0 - 0.25

If you want to do this automatically you could follow the description I gave recently:

Sentinel 3 olci RGB unit interval

This is not easily doable. But you can use the expressions to do it with pconvert. red = Oa09_radiance < 0 ? 0 : Oa09_radiance > 430 ? 430 : Oa09_radiance This limits the values between 0 and 430. For the blue and green channel do it equivalent. As additional option to pconvert use the -s option to disable the skip histogram values. With -s 0,0 nothing will be skipped. I thinks this will do what you want.