If the first copy made of someone after he's been disintegrated is really him then what of the second copy?
Thats the big mindscrew. If its all real organic matter (neither one is going to lose integrity or die or fall apart or anything) and the memories are absolutely identical then ... can you even tell which one came first? How could one be more real then the other? They are BOTH you. Welcome to the world of Thomas Riker.
This type of stuff used to come up for debate a lot on the Heroes message board early during the (much maligned and many lost opportunities) 4th season. The entire personality and every memory of one deceased character was imprinted into someone else (complete with DNA based shapeshift).... if you remember everything you have ever done, and you look in the mirror and see yourself.... who are you?