Broly DBZ and Broly DBS are friends. 

Broly DBS is innocent, calm and quiet as always, he doesn't talk much because he didn't really know how to communicate. He also stutter when speaking 

While Broly DBZ is crazy, brutal and aggressive. He hate Kakarot so much, he only wish to kill Kakarot already.

 Both broly are tall and muscular especially Broly DBZ. They both also had legendary super Saiyan power. Their both are Saiyans. They also can be undefeatable if both of them went berserk.