I have not done it, but I'd expect you to get different shades from the buff to the RIR red color with the offspring of that cross. Some will come back the dark yellow/orange, but they will not all breed true to that color. I would not expect you to get different colors like black, white, blue, any of that, just varying shades from buff to red.
I've got a couple of pullets from a SS roo x BO hen cross. (The speckles are recessive so they do not show.) I suspect what I have is very close to your color with the RIR. It does make a pretty pullet.