Not quite similar.
Adventure Island...has no central theme other than tropical touches of asthetic to a water park. It is of course, the worst of the major FL water parks. It is really old and an extension of Busch's property in Tampa. We would hope Disney would do more than that.
Islands of Adventure is different. While it has slacked a bit with Potter. The concept was a nautical connection to adventure. While sometimes brought into context, it still had the connection with a shore for each "island" and Port of Entry being the land that ties it together.
Universal Studios
Disney Studios
and Hollywood Studios kept the connection to the movie making and hollywood that is inspired by real, never was and always would be as its central theme.
EPCOT, for a long time still had the spirit of a World's Fair in showcasing tech and culture through inspiration.
Adventure World sounds like a carnival.
This...
This has no central theme but that they are worlds, and you are going to have adventures. Adventures is in every story. So to use it as the central theme or world does not make sense.