That is just a die event. It can happen to any of the dies with that design. So there is not an exact die that creates these. They are not a variety, but a die event. The differences?
All dies start off fresh, but as they are, events happen to the dies. To seasoned collectors, we don't call them die errors as to me a die error is a one time happening. (Note the box above) Hundreds of thousands of coins will show die events. But an error coin to me is a one off example.