The only difference you'll run across sometimes is that certain region versions will have more or less language options in the game itself, but other than that, they'll usually be identical. Especially with the modern consoles where everything is region-free and there's no different video signals to worry about, there's really no risk in buying a game from another region
Some (all? not sure) DLC is region locked which can be a bitch
I dont understand SLG`s business : the game is not limited, only the box art ?
It's not just SLG but places like limitedrun too. Like Celeste had a LRG release but also a playasia release. Streets of rage 4 had a LRG release but i can walk into a local gamestore and buy it too just to name a few examples. What's limited it
their version, it doesn't guarantee where will be NO other versions of the game, although for a lot of games in practice that will be the case.
Basically they play into the collectard feelings of wanting exclusive items, that's their business.