Duplicate
Clone
The word is duplicate.
exact
final
Another word which means a small copy is replica. Replica refers to the exact copy or reproduction of something original but on a smaller scale.
Word meaning to make an exact copy is - replicate -
The word "duplicate" can function as both a noun and a verb. As a noun, it refers to an identical copy of something. As a verb, it means to make an exact copy of something.
One such word is innocence. blameless
replica or duplicate
Cloning
The word you're looking for is.... clone !
Accurate is the one that comes to mind.