It's like a house made of Legos. Swap out the bricks and it's still a Lego house. Take it apart/destroy that "pattern" and it's no longer a house, it's Legos. Put it back together, it's a Lego house again. Swap out a person's atoms for identical atoms, same person. Shuffle their pattern? Bad time.

With this technology, you can: -Create a pattern for anything, living or nonliving -Print any pattern you have access to If somebody has access to your pattern, they can print as many copies of you as they'd like. I, personally, would take little comfort knowing they wouldn't be the same atoms.