Will Adding or Removing a Resource from Enterprise Projects Change Its VPC and CIDR Block?

No.

Migrating a resource between enterprise projects only affects permissions of users associated with the projects.

Migrating a resource from one enterprise project to another does not affect the resource itself. For example, the resource instance will not be restarted, the network configuration will not be changed, and the ownership of the resource will not be changed.

However, the access to the resources of an enterprise project may be affected if resource permissions are configured based on the project and the project is adjusted. For example, if you only grant a member the permissions to access resources of project A, the member may be rejected to access the resources when project A is migrated to another project, such as project B.