The Adventure has greater capacity so prices reflect that, however, the prices for Disney parks in Asia are generally cheaper in line with reflective incomes. I also think Disney USA has a large market with some substantial wealth and can get away with charging more because people pay it.
The cruises on the Wonder from Australia aren't cheaper than the US, they're equivalent. Factor in that $1AUD = .62C USD, so actually our Australian cruises are comparatively 'more expensive'. Especially when the dollar drops. Disney dont charge in Australian Dollars (lunacy if you ask me because other cruise lines here do).
DCL sold well on their first season (which they promoted as a one time only) but could not fill the Wonder on the second. There's several reasons for this including Disney not preparing for the different culture they're operating in, scheduling longer cruises when the kids are in school (they didnt seem to investigate that), tipping culture being vociferously rejected, but mostly, the price is seen as prohibitive.
Most cruises last season needed to be discounted by 30-35% as GT rates. I think Aussie families look at the price and book an alternative line. There's a lot of choice here. I expect Disney will need to deeply discount the coming 2025-26 season. It's an open question whether they will be back in 26-27. The murmur is that they're bringing the Magic in the hope a different ship will increase bookings. At this time, the market seems to be telling them they're not worth the premium they're charging.