Your confusion stems from the difference between build numbers and release number. Within a given release (e.g. 2.0.25), the build numbers may be different for different platforms.
Just have a look a the release notes:
You will notice that for the same release 2.025, the build number for the Roon and RoonServer apps is 1353, while the Android/iOS Roon Remotes are on build number 1352. Even so, all these components form part of the same release 2.0.25.