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https://1.bp.blogspot.com/_Edv_j67S...wRFLa8/s1600/hembeck+vukojevich+copy.jpgThe above Iron Man, Hulk, and ROM drawing by Hembeck is from AVENGERS CHRONICLES, in 1982.
https://www.mycomicshop.com/search?TID=304161And this one from the Hembeck files...
http://www.proudrobot.com/hembeck/grell.jpg 
There was a joke about "How do you tell them apart?" when Grell was drawing both WARLORD and GREEN LANTERN/GREEN ARROW at the same time, circa 1976-1980.
Hembeck could have done another follow-up comic strip, where Warlord and Green Arrow are still standing there, and Mike Grell walks up and joins them. Grell was known in that era to have a similar beard himself, so the joke could expand to ask: how do you tell Warlord, Green Arrow and Grell apart?
