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The phrase "opposite number" is correct and usable in written English.
It is typically used when referring to someone in an opposing group or organization, or a person who has the same role as you but in a different organization. For example, you could say, "I spoke with my counterpart's opposite number in the other company."
Dictionary
opposite number
noun
A person who holds a position in an organization that corresponds to that held by another person in an other organization; a counterpart
synonyms
Exact(60)
His opposite number was distraught.
Elaine deserves a more compelling opposite number.
Rae's opposite number, Shaun McRae, was happier.
Cheney's institutional opposite number was Prescott.
Rosie Winterton: Chief Whip Opposite Number: Patrick McLoughlin.
Harriet Harman: deputy leader Opposite Number: Nick Clegg.
Davis Love III, Clarke's opposite number, conceded different emotion.
The gossip's opposite number is the social zombie.
His opposite number had novel views of his own.
And, unlike his opposite number, Hola converts, too.
"Never in doubt," his grinning opposite number Nigel Worthington joked.
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com