Pinky is not Pinkie. Nope, that's a completely different mare. The two have absolutely nothing in common, and Pinky certainly isn't a magically-made clone of Pinkie, no Sir. Pinky is just your average, non-Pinkie mare, trying to get on with life.
Which makes things a little difficult when a certain other mare, one who totally isn't the original flesh-and-blood pony of a cloning magic that never even happened to begin with, comes waltzing in out of nowhere.