you can detect hitTest() between any two movieclips.
How am I going to refer to the same movieClip using hitTest?
Well you can't really test against the same movie clips. If they all have the same names how would flash know which one was hit? When you attach them you should give each one a unique name:
That is one way, especially if the number of them will remain fairly constant over time. If they are coming and going a lot, maybe you would want to push/remove them from an array and then test against the array.