Unless you need the new features (e.g. if you are running on a NUC12 or later and want to use HDMI audio), you are unlikely to see any difference between this older early access build and the current production build of RoonOS.
As you have seen, the build of the OS has not affected your ability to run the latest version of Roon Server.
Having said that, as I posted above, the instructions for returning to the production build of RoonOS (261) can be found in the RoonOs early access release announcement at: