I see people on various sites trying to help explain the colours, but no one seems to be coming up with anything close.
Movor was probably closest, but neither mode matches the arrangement of the colours on this Astrotrain (the orange is on the wrong side of the shuttle mode, and is the legs instead of chest in robot mode).
And Gen2 Starscream would go with Thrust.... but why one Gen1 and one Gen2... it kinda ruins the point of a homage 2-pack that doesn't homage the same era.