You don't need to, as the game automatically transfers saves between all versions for you. If you're backing up, or moving to a new device/OS, however, you can find the save locations here:
WHERE ARE SAVES LOCATED ON ANDROID? Android/data/com.domain.corruptedkingdoms/saves
WHERE ARE SAVES LOCATED ON PC?
PC > Local Disk (usually C:) > Users > USERNAME > AppData > Roaming > RenPy > CorruptedKingdoms-1547378918
WHERE ARE SAVES LOCATED ON LINUX?
~/. renpy/CorruptedKingdoms/
WHERE ARE SAVES LOCATED ON MAC?
~/Library/RenPy/CorruptedKingdoms