Collector's Edition DIGITAL In-game Items for Other users in same PS4

[Niwashi]

The game needs to be purchased and an SE account set up for each user that's going to play it. If two people share the same PS4 but with different PSN accounts, then they need two copies of the game and two SE accounts.

You get the collector's edition items if the copy registered to your account is a CE copy. You get the "free" month (which isn't actually free, but is included in the price of the game purchase) for any copy registered to your account whether that's a collector's edition or not. Without a copy of the game registered to your account, you wouldn't even be able to log in, regardless of what someone else sharing the same machine has on their account.