"Android Old" works better on older phones but you only have one save location.
"Android New" works only on newer phones and stores your saves in two separate locations.

It's recommended to make a backup of your saves before installing the new version.

1. Backup your old saves. They should be located in /android/data/mist.game/saves
2. Delete the old version of the game.
3. Then download and install the new one.
4. Return the saves you backed up into the savefile direction mentioned above.

This time again Estrada has helped me by providing these two android builds, thanks a lot!