Illustration from Linda C. Cain and Susan Rosenbaum's "Blast Off" (1973) by Leo and Diane Dillon references 'Man-Ape' (1967) by Frank Frazetta ?

leading from

"Man Ape" (Published January 1967) by Frank Frazetta

and

Illustrations from Linda C. Cain and Susan Rosenbaum's "Blast Off" (1973) by Leo and Diane Dillon

 

a) Illustration from Linda C. Cain and Susan Rosenbaum's "Blast Off" (1973) by Leo and Diane Dillon

b) 'Man-Ape' (1967) by Frank Frazetta

 

c)  The artist perhaps liked the way that red cloak spread around everywhere against the darkness and decided to have the the orange upper garments and the orange hair and the pink trousers appear to merge into a combined form running through the illustration. 

d) Conan's left arm becomes the girl's arm behind her back while the red glow on in the right side of Conan's head becomes the red ponytail

e) A few segments of the stone floor become the rocket being drawn by the girl on the ground,
while the ape man's foot become the girl's hands
 

 f) See also: HR Giger's Mordor IV (Work 280) (1975)