From what I've experienced, as long as you put the new version in the same place you have the old version without putting them inside each other, you should have access to the old versions save data on the new version.
If the dev is not super careful, using an old save file on the new version might not work properly. When I tried my older version save file in the newest release and went inside Pewder Poke center a Lily scene that I completed long ago happened again, but I didn't check if the quest was permanently broken after it.