Super Nintendo World (Universal Studios Japan expansion)
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DKC during night

Source: https://twitter.com/123456789usj/status/1763373515947000035/

Donkey Kong Country from the sky

You are correct! According to Google Earth, the original Nintendo World (excluding MarioKart ride building and entry pipe) is ~6500 m^2, and the Donkey Kong expansion is ~8500 m^2. However, if you include MarioKart ride building as part of original Nintendo World, then it is bigger, as the MarioKart building itself is ~6900 m^2 (~13400 m^2 combined, excluding entry pipe).