List of Donkey Kong Land 2 pre-release and unused content
From the Super Mario Wiki
This is a list of pre-release and unused content for the game Donkey Kong Land 2.
Donkey Kong Land 2 originally had the sub-title Diddy's Kong Quest. This was later removed, probably because it would cause people to think the game was an exact port of the game it was based on, Donkey Kong Country 2: Diddy's Kong Quest. While it was removed in the international builds, the Japanese version's title screen still contains it.
There is an unused 8-bit version of "Boss Bossanova" located in the game's files.