vSphere uses a key provider name to look up a key identifier. If two key providers have the same name, vSphere assumes that they are equivalent and have access to the same keys. Each logical key provider, regardless of its type (Standard, Trusted, and Native Key Provider), must have a unique name across all vCenter Server systems.
In a few instances, the same key provider is configured across multiple vCenter Server systems, such as:
Migrating encrypted VMs between vCenter Server systems.
Setting up a vCenter Server as a disaster recovery site.
