What Are the Differences Between IAM Projects and Enterprise Projects?
IAM Projects
IAM projects group and physically isolate resources in the same region.
Resources cannot be transferred between IAM projects, but can only be deleted and then created or purchased again.

Enterprise Projects
Enterprise projects group and manage resources across regions. Resources in enterprise projects are logically isolated from each other.
An enterprise project can contain resources in multiple regions, and resources can be transferred between enterprise projects.
You cannot create projects in IAM after enabling Enterprise Management. Enterprise projects will gradually replace IAM projects in future and are recommended for flexible resource management.

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