When Working Group 8 to ISO Technical Committee 34 developed ISO 22000, the WG did not intend that a company would transition from an ISO 9001 compliant quality management system to an ISO 22000 compliant food safety management system. The WG intended that the company would use both standards, where ISO 9001 describes the requirements of a quality management system, and ISO 22000 describes the requirements of a food safety management system.
ISO 22000:2005 and ISO 9001:2000 are compatible standards. They share equivalent, but not equal structure and elements. Annexes A and B in ISO 22000:2005 provide a table of official cross references between the two standards. A table has been developed to help the reader understand the differences between the two standards.
Full document – Comparison of ISO 9001 and ISO 22000