Don't have a color match but if you can't find one, it's completely proto to have mismatched hatches
Even green ones. (or white fiberglass ones, or silver aluminum ones)
I give you props for calling it freight car red. I've been in the "mineral red" camp with the opinion that most of BNSF cars are more red than brown. But some insist it's more "mineral brown" like the old Santa Fe colors in the 60's/70's. Which...has led to some really bad looking BNSF models over the years. [/soapbox]
Anyway...I don't have an answer for your regarding Scalecoat II but very interested if someone does.