A bad port of a fantastic game.
Not much. That's all I have to say.
Bosses and stages cutscene voices and characters Steve and Bob have been removed, and character sprites, sound effects, and the bonus stage are slightly different. You now lose $1000 each time you take death.
The Bottom Line
If you are looking for a port of Sunset Riders to play at home, buy the SNES version. Because the Genesis port of the game is guaranteed to disappoint you after a week.