or on a humoristic note: "super-collègue"
👁 Big Grin :D
(with the hyphen, otherwise it's not fun anymore... Ou tout attaché : "supercollègue")
We don't use much the word "pair" (appart from specific contexts, such as in court...)
le "collègue du mois" (as we have "l'employé du mois") ?