When two identical matter exist in the same universe , it will "entropic cascade" , like what happen to Alternative Carter in Episode "Point of view"
It happen after a few hour, but Carter thought it would take years for "entropic cascade" .
People can move around , and die then decompose.
But spare parts?
The Damage Destiny's spare part are the one that still world on the (real or current ) Destiny.
If they mixed part and use on Destiny, two exact same part could connect with their counter part.
If the duplicate part gets "entropic cascade" , the ship could get into serious situation.
And after a while nobody can tell which part is from the duplicate Destiny.
Wonder what happen when two exact matter occupy the same space?
If the Shuttle and the duplicate crash into each other , would the fabric of the unvierse get tare apart?