They’re actually different companies. Devir was the official (and exclusive) distributor for both Brazil and Portugal, this is confirmed by the Base Set booster box shared by @packyman . I also came across a print of a Nintendo World magazine (check it out here), and there’s note mentioning Devir “launching” Pokémon in Brazil, but according to my conversation with the Devir representative, Devir never printed the cards themselves.
Cartamundi was the company that printed the portuguese cards during the WotC era in Belgium. And since they acquired Copag in 2005, technically… they still do hahaha.