The object on your CreateEvent is the object in which you want to look for the correct event. So if you spawn an actor and put this actor in the object input, this actor needs the function. If the function is inside the blueprint where you spawn the other actor and not in the other actor, use SELF as object.
The function OtherBlueprint is inside the BP_TestActor
The function SameBlueprint is inside this blueprint (search here => SELF)