If you have one of the paid versions you can use "the family trick" to do this.
Just add the object to a family, and add a variable to both the object, and the family.
Then when you create the object set its variable, and its family variable.
For the collision event:
+>object variable= your value
-->object is overlapping family
--->family variable = your value, do stuff
Would it be possible to add something like is overlapping(at offset) other instance, and collision with other instance?
While using a family works, it still seems kind of hackish.