I don't think they should really be different. While you did pay the extra $60, (Sorry, I'm in the U.S), for the Ghost edition, you also are getting something extra that's NOT included in the Limited edition, the Ghost replica. Considering they're offering three different special editions to choose from, I don't think it's unfair for the digital content for all three to be the same. Each has their perks whether it's physical or digital. I would just enjoy what you have and don't worry too much over it, there's really not much that you can do now anyways. If you truly want to have something that you can show off that shows how much you support the game, maybe there will be an emblem or item that shows that you've dedicated a lot of time in the game which is where the real support comes from.