ok I solved it somehow... Maybe it's not so professional, but it works...
I use Vector3 Compare / Vector2 Compare, which I downloaded from the Addon EcoSystem.
There I put in the 1st Variable the Vector3 Coordinate, where I drop the object and in the 2nd Variable the Vector3 Coord., where it should be.
The Tolerance is the "area" around the 2nd Variable (as I understand / see)
If it's equal it goes to my "Inside" State and if it's not equal it goes to my "Outside" State.
What do you think? A nice solution or crap??
PS: There is one problem:
This works only if the object / area is a square/box, because the tolerance is around one coordinate (in this case the middle of the object) So if the object is one side longer or has a different form, it won't work on the side.
So this should be solved with "is the object over the other object", but I don't understand what is meant with "resize". - I guess something simple, but I'm too stupid for it