Hi Pham,
The calculator I used in such scenario is this one - https://techlibrary.hpe.com/us/en/enterprise/servers/licensing/index.aspx
Also I will suggest you to contact Microsoft so you are clear and follow the License model and so you do not mismatch the license requirements in the Environment. Do you have a contact with the Volume Licensing team if yes you will need to clarify your queries.
Hope this helps.
JS
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