Pretty much everything— the shape, weapons, etc. for instance, while both men have flame throwers and whipcord launchers on their respective right hand vambraces Din Djarin has flame throwers on both vambraces, not just the right one. Boba Fett has dual lasers on his left vambrace, as well as a rocket launcher whereas Din Djarin has Whistling Birds on his left vambrace. Boba Fett also has dart launchers on his right vambrace, Din Djarin does not. Din’s flame throwers are also shaped differently than Boba’s.
