Hi,
They are different keys.
The KMS host key is the one you obtain from the Volume Licensing Service Center, A KMS Key is used to activate the KMS host computer with a Microsoft activation server and can activate up to six KMS hosts with 10 activations per host. Each KMS host can activate an unlimited number of computers.
Reference: What is a KMS Host Key
The KMS Client Setup Key is used for each product/version combination to bypass activation (that is, unlock the product).
Reference: KMS client setup keys, What is a Setup Key
Best regards.
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