2 French posters for 2 different spaghetti westerns that were both made in 1966. The 1P on the left, titled
Sugar Colt, was directed by Franco Giraldi. The moyenne poster on the right, (the English title), is
One Thousand Dollars on the Black (aka
Blood at Sundown or
Mille dollari sul nero- Italian title), and was directed by Alberto Cardone (tho credited as Albert Cardiff on the poster).
Sugar Colt was released in October of 1966 and One Thousand Dollars on the Black in December of '66.
I'd say one heavily "borrowed" from the other, with just the slightest of artistic modifications.