Thank you, Carlos. I agree. Examining these pictures, it does indeed appear to be a different actor. Too bad.
Anyway, here is an interesting discovery about this actor. He appears on the cover of the very rare fotoromanzo Genius N. 66: "Il tuo corpo è tatuato?" (Published 9 December 1968):
Unfortunately, I don't have this fotoromanzo, but Genius was also published in Argentina under the name Goldrake, and this particular issue was published as Goldrake N. 29: "Tu cuerpo esta tatuado?" in 1973, and I have found a scan of this Argentinean version on the net. As you can see, the cover motive is the same:
Our man has a great role here - as a bad guy, of course! What else?
Unfortunately, there are NO actors credited in this Argentinean edition, but given the size of our man's role, he might
be credited in the Italian edition. However, I have many of these Genius fotoromanzi and the cast lists are really bad, because almost all of the actors are credited under very silly Americanized pseudonyms, so I wouldn't spend too much time and energy trying to hunt down this fotoromanzo...