Hi,
You can download the Windows Server 2019 Feature comparison summary PDF from here https://www.microsoft.com/en-us/windows-server.
The PDF shows the differences between Windows Server 2008 R2, Windows Server 2012 R2 , Windows Server 2016 and Windows Server 2019.
(If the reply was helpful please don't forget to accept as answer, thank you)
Best regards,
Leon