How to make 2 of the same projectile do different things?

[onion_hq]

How can I make it so that if a player causes a snowball to be launched, the snowball can cause 2 separate things when it lands depending on which item the player is holding?

 

[ChocoPlays]

For this you can either set the snowball's name when launching the projectile, and then detect the name by using If Entity , you could also use UUID's and variables but the naming is the simplest option.