Et bien je pense que c'est loupé !
voici ce que je viens de lire sur le UbiSoft Help
"If you own the Standard Edition of a game, it is not possible to upgrade your game to a more extensive edition, like a Deluxe or Gold Edition.
Most content is available separately. So if you wish to upgrade to a Gold Edition for example, you could buy the Season Pass in addition to your Standard Edition.
To ensure that the content is compatible, we would recommend that you buy the additional content in the same platform store where you bought the base game."
ce n'est donc pas lié au PSN