1/3
3 Years of Service
as long as S version is newer, sure, otherwise is not recommended to use newer saves on older version. at best all that was done and made in between versions you will have to redo, at worst can mess things up you wouldnt even know.Can you switch between the regular version and the "S" version when you play?
in short, you can switch to check things up, but i wouldnt recommend to save with older version, better to wait and get hands on newer S at some point. but then again also depend on how much has changed in between versions. up to you to decide.