Thank you for the IDs Vojtik, but unfortunately they are all 'standard' dreadlords (as in, not with the elite bright wings and horns).
I am sure the red version might be somewhere out! But until then, I can use the vertex colours and the purple model to make an amber (orange-ish) dreadlord. The skin is slightly dark, but works fine. Not sure if I'll use it for RP however... Because, you know, the skin is a bit too dark and is not outright red. I might settle for Mephistroth's ID instead, the blue version!