Is LuCI 19.07 stable version and can it be used along with OpenWRT 18.06.02 stable version?

@slh Thanks for your response We are using the complete LuCi package 19.07 on OpenWRT base 18.06.02.

With LuCi being distributed as a separate package, Can you help me with the relation between the base packages and the Luci packages?

Also, it would be great to get some information on the Directory structure changes.