The biggest difference is that his farming days come after the Avengers have reversed his “snap” and his retirement is by the authority of Adam Warlock, an essential character to the monumental comic event who has yet to be properly introduced to the MCU, outside of a subtle hint in a Guardians of the Galaxy Vol. 2 post-credits scene during Phase Three.
Despite the liberties that the MCU took in adapting the storyline to film, this is an almost perfect visual representation of the conclusion of Marvel comics’ Infinity Gauntlet storyline, right down to the show of Thanos’ Titan armor scarecrow.