@Dennis Tuttle
Hi,
These are two different versions, a long term servicing channel and a semi annual channel.
Windows Server 2019 (Long-Term Servicing Channel) (Datacenter, Essentials, Standard)
Windows Server, version 1809 (Semi-Annual Channel) (Datacenter Core, Standard Core)
If you are using Windows Server 2019, the support ends 1/09/2024.
Hope above information can help you.
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