Change management' is defined as the means by which an organization transitions to a desired future state. It involves the processes and techniques used to manage the people side of change to achieve the required business outcome, ensuring that changes are implemented smoothly and effectively.
PRINCE2 7 Foundation materials on project management terms and definitions.

PRINCE2 requires a minimum of two management stages for any project: one to initiate the project and another to deliver the project. This structure ensures proper planning, delegation, monitoring, and control over the course of the project lifecycle.References: = PRINCE2 7 Foundation handbook and online resources

The 'managing product delivery' process in PRINCE2 ensures that the planned products meet their quality criteria (ensuring products are fit for purpose) and that these products are delivered within the agreed tolerances (ensuring delivery within time, cost, quality, scope, risk, and benefit tolerances). References:
PRINCE2 Foundation Handbook, Managing Product Delivery section.