What is the difference between roon core and roon server ?
Same thing - just different terms.
Have look at the knowledge base:
If you mean what is the difference between Roon and RoonServer, then RoonServer has no GUI and therefore can’t act as a Control point, but is Core and can be Output.
Roon is also Core, but can be a Control point and Output.
Think of “Core” in the conceptual context of Core / Endpoint (zone) / Remote.
RoonServer is one way to materialize a Core. There is also ROCK, a full Roon desktop install, etc.
Thank you guys