Organisation and integration are related but distinct concepts.

Organisation refers broadly to structured arrangement. A system may be organised because its components exhibit order, pattern, or regularity.

Integration refers more specifically to the organisation of significant relations into coherent functional wholes. It concerns how what matters becomes organised into coordinated patterns of activity.

Many systems are organised without being strongly integrated. Components may be arranged in orderly ways without contributing to a coherent functional pattern. Integration requires more than structure. It requires functional coherence.

Communication, coordination, and regulation often contribute to integration, but none is equivalent to integration itself. Integration refers to the broader process through which significant relations become organised into coherent functional organisation.

In APS:

Organisation describes structure.

Integration describes the coherent functional organisation of what matters.