In Stage 6 of the SNES version of Sunset Riders, a major censoring had taken place...
The original arcade version's Stage 6 resembled the "Cowboys and Indians" battles of old Wild West movies from the 50s and 60s. Basically, your character was up against Native American warriors armed with bows and arrows, and the boss of the stage was a Native American shaman warrior (with a stereotypical name, of course) named Chief Scalpem. In the SNES version, ALL of the Native American warriors were removed and the generic bandits from the rest of the game were put in their place, yet Chief Scalpem remained the boss of the stage.
And from what I have heard, the Japanese Super Famicom version of Sunset Riders has its Stage 6 intact, remaining the same as the original arcade version!