This hack simply swaps the music assigned to Arich (plus Kroctopus) and Baron K. Rool's boss levels, as those "allegedly" got mixed up during the game's development by mistake.
Patches for all regional versions of the game included in download.
Database match: Donkey Kong Country 3 (USA)
Database: No-Intro: Game Boy Advance (v. 20210227-023848)
File/ROM SHA-1: C50982B4C26E25BA3538BE97B585D95737D7ADE7
File/ROM CRC32: FE03E5AF