How do I check two different instances are on the same X&Y?

How do I check two different instances are on the same X & Y positions (One is above each other and hides the other one)?

I'm talking about the same sprite but two different instances.

I tried the family method.

RustyRoi

Here's an example of dragging and dropping sprites and checking for an exact location match.

[attachment=0:1jofr7wk][/attachment:1jofr7wk]

You might be able to adapt it for your project.

Thanks for the help!