First, the City and County each draft and approve their own local legislation completely separate from one another. The County answers to the Sacramento County Board of Supervisors, while the City answers to the Sacramento City Council, both elected but independent bodies.
Second, the County must meet the needs of a more diverse population than the city.
While the City of Sacramento is largely urbanized with a dense population, the County covers a much larger area, with population that live in agricultural or rural neighborhoods with different needs than urban centers.