checking values of an variable of two instances of one object touching

hello!

i am making a game where stuff has to combine and i have a problem. i want to do that if two instances of object "ball" that are the same level touch one instance will gain a level and the other one will get destroyed but i don't know how to do that so if someone could help it would be nice.

the code i have right now:

Usual fix for this is to put Ball in a Family, and for the level variable make it a Family variable, then you can pick the two objects individually one is Ball and the other is Family, so Ball on collision with Family, if ball.level = family.level etc

Thanks man! appreciate your help. it worked!