For some time Windows Insider devices on the slow ring have been out of sync with the Release Preview ring. Slow ring machines were on 18362.10022 while release preview is at 18363.418 which Microsoft have confirmed will be the build that goes out to normal Windows users. If you selected to switch back to Release Preview you will get an update bring your machine to 19H2 / 1909, the Windows 10 November 2019 Update. If you stay on the slow ring you will soon get a 20H1 build so check your Windows Insiders settings now.
The update is a full build of Windows 10 and takes the build to 18363.418.