The ISO standard contains guidelines for selecting and using the standards for quality assurance, that is, it is the one that allows selecting a quality assurance model, among which ISO 9001/9002/9003 are described.
The ISO 9004-2 standard establishes guidelines regarding technical, administrative and human factors that affect the quality of services, that is, it refers especially to services.
The ISO 9001/9002/9003 standards establish requirements that determine what elements the quality systems have to include, but it is not the purpose of imposing uniformity in the quality systems.