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The RGB filters cut 2/3 of the spectrum each, so you would expect to have different settings for the colours compared to Luminance.
There are subtle differences between the individual colour filters. Sensors do not have a uniform response across the spectrum, and different objects will emit in different areas of the spectrum.
I usually find that G and B channels tend to be more noisy. Sometimes I'll get more subs in those wavelengths to combat this, but I don't vary the gain or exposure (between RGB filters) because otherwise you'll have different FWHM on the stars.
Markus
Cheers
M
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