Here’s a fun single-page comic, written by Robert Barrett, drawn by Richard Corben, featuring dopplegangers of Conan, Tarzan, and Prince Valiant:
According to The Most Complete Comicography of Richard Corben, “Duel of the Titans” was first published in the fourth issue of the venerable E.C. fanzine, Squa Tront, in 1970, and was reprinted eleven years later, in 1981, on page 25 of the only book on Richard Corben’s career and art, the long out-of-print (not to mention long out-of-date) Flights into Fantasy.