Scratch

I have a sprite called BOX which has a set of scripts in which it checks its own x position in relation to the x position of another object.  Currently, it checks its own x position by sensing "x position of BOX".  Is there a way to make a sprite reference itself in another way?  I want to duplicate this sprite many times, and have each one act independently.  However, when I duplicate BOX, and the new item comes up named Sprite 1, all the references still reference BOX.  I don't want to have to manually change all these to say Sprite 1.  Is there a way to make a sprite check "my position" (its own position)?

Thanks in advance.