[shellac]

Yes, perhaps better thought of as a distribution or packaging. Somewhat analogous to linux distributions.

I thought Azul was a bit more customised around the gc, so not quite the same JVM?

[belter]

I think you are talking about their other offers? I was referring to ones at the bottom of this page under section: "Download Azul Zulu Builds of OpenJDK"

https://www.azul.com/downloads/?package=jdk