Re: Merge Action Memo and s-notes on 2 devices.
Yup, just sync your S-Note app to either your Samsung device or (my personal preference) Evernote. The advantage of the latter is that your notes are also available on the web, without a Note device (or Samsung for that matter) in any web browser, or even a different phone as long as you have the Evernote app installed.
Go to your S-Note Settings, Accounts, and set it up right there. Just remember, if you do select Evernote, your notes might be visible on their website and synced to their app in other devices, but you can only edit them in S-Note.