I think you'll find that all Red SS VR's were finished in Diablo and not the other Red offered in the VR range, that being Masai Red which was carried over to VS. Masai wasn't considered a sports colour and thus would've been a "special order" vehicle.
Diablo also carried over to VS and then VT where it was replaced by "Sting" and then later "Redhot" which incidentally was the colour of the very last VF produced at Elizabeth.
BTW Cardinal Red was a late VL colour that replaced Venetian Red.