The saves will only go away if you uninstall. If you install the new version as an update, it should be fine.
You could make a backup if you feel like being safer.
WHERE ARE SAVES LOCATED ON ANDROID?
- Android/data/com.domain.corruptedkingdoms/files/saves
NOTE: If you’re running Android 11+ then Google has hidden your data folder. To access it you need to connect your phone to your PC with a USB cable or use an app like Solid Explorer or X-Plore to give you access to the folder again.