Star Wars (1977) #6 and Star Wars (2015) #6 (Montreal ComicCon)

The final chapter in the Star Wars movie adaptation, Star Wars #6, has a cover showing Luke Skywalker and Darth Vader having a lightsaber duel while a dogfight occurs in the background.

Star Wars #6a - Marvel Comics, U.S. (December 1977)

Whilce Portacio drew a homage to this cover for the Montreal ComicCon exclusive Star Wars #6.

Star Wars #6d - Marvel Comics, U.S. (June 2015)
Montreal ComicCon exclusive

On the homage cover, Darth Vader is more menacing due to the heavier shadows and Luke Skywalker is brandishing a blue lightsaber instead of the red lightsaber he is show using on the original cover.

The Star Wars logo on the original cover is different than the logo on the new cover.  The new cover uses the logo found in the movies and on most products.  The original logo used by Marvel is similar but the letter are more squished and the W is different.  That logo was used throughout the original Marvel run.  Lucasfilm was more lax at the time; many foreign comics used localized logos in the native language until Lucasfilm asked for all Star Wars licensees to use the standard Star Wars logo.