Technically even Limit Breaker is more properly called "Super Full Power Saiyan 4 Limit Breaker"
English fans simplify it down to SS4 Limit Breaker because the full name is more of a mouthful than "Super Saiyan God Super Saiyan" and because most barely even consider "Super Full Power Saiyan 4" to be its own thing (even though it is going by official media)