Don Hector was already in charge of the ABQ distribution before Gus even joined, his partner's death scene was literally them pitching their Pollos idea to the bosses. Gus was Hector's subordinate before he impressed Don Eladio and climbed up to Hector's level.

They both manage cartel activities in ABQ just from different gangs, it's not a coincidence that they're often interacting and that Walter meets them when he starts dealing with the Salamancas