Version Numbers and Build Codes and Joy APK Game: A Guide for Low-Storage Android Phones
https://apkgameselect.urbanvellum.com/posts/version-rollbacks-with-apkmodjoy-myths-facts-and-safer-choices
On a phone with little free space, every download and update needs a little more planning. Version numbers help people recognize releases, while build codes give Android a numeric way to order app builds