the.com/counterpart

The person on the other team who has your exact job and none of your context.

means A person or thing that corresponds to another in function or form — your match on the other side of a relationship, deal, or org chart.

from Built from 'counter-' (against, corresponding) plus 'part,' it traces to the old practice of making a legal document in two matching halves — the 'counterpart' of a contract was the duplicate copy that corresponded exactly to the original, so each party held one. The sense widened from matching paperwork to matching people.

diplomacy use
standard term for your opposite-number official abroad
not synonym
counterpart matches role, not personality or skill
etymology
from matching halves of a torn legal document
corporate tell
meeting your counterpart usually means a merger looms
the.com · every word