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I would guess that a "current copier" provides a current in the same direction (source vs sink) as the reference current. A current mirror supplies a current in the opposite direction of the reference current. Never heard the term "current copier" before.
EDIT: See link: https://www.electro-tech-online.com/custompdfs/2009/11/EPFL_TH890.pdf
Excerpt from above link:
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