I believe in hex values if they are gamma corrected to linear,like all sRGB images gets converted to linear for the linear working space.
@KickAir_8P i have looked at blend file.Nice node group.I have not looked at the values,but i noticed that you put your generated colors into the principled shader,which has by default a specular with a IOR of 1.5 active.
For more angle independent albedo reflections of the colors i would just use a diffuse shader for this reason.