Doomsday Album #14 and Guilty as Charged: Cross pollination between Murray and Gredown

I still don't know the origins of this image, but it does appear in modified form on the cover of the Gredown magazine Guilty as Charged:

The Guilty as Charged image is courtesy of AusReprints. I came across it while I was searching for something else. All credit to James for establishing the connection first, but I did discover it independently too, so I'm patting myself on the back regardless.