How to create a creature that explodes mobs?

hi, i was wondering a way to make a creature explode near a mob, like the creeper near the player, but this time with mobs instead of players

I tried to put the creeper's there ready but even though my mob is a creature, he with the creeper configuration he is mob and he ends up following the player to blow it up and as I left it configured for him to kill only mobs he ends up killing the partner just like him. Then I wanted to know how to make a creature explode near a mob like the creeper but without selecting the creeper's AI