Just want to know if it is possible to keep all my saves by keeping the saves together in one folder and delete the old versions？
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Yes, just copying the saves folder from inside the ‘game’ directory and putting it back in the same place on any other version will keep all your saves on Windows, unless at some point the save data changes format and everyone is forced to start over.
I can’t speak for any other OS. Someone else will have to chime in if thats the case.
Here is a direct quote from CursedFlame’s post explaining Android saves.
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.