Question: This SNES game received a Game Boy Advance remake in 2003. If Microsoft purchased Rare from Nintendo in 2002, how were Rare and Nintendo able to make the game again?
Question: Why does the Game Boy Advance remake involve the bosses being differently battled, such as Queen B using Zingers, and have cameras as collectibles, which the SNES version does not have?
Answer: Because the game boy advance has high quality, they added cameras, which expanded the SNES version into the game boy advance version.
Answer: Nintendo always owned the rights to Donkey Kong as they created him in the 80's. Rare was just backed, financially, by Nintendo and developed the Donkey Kong Country game for them. When Microsoft bought Rare they knew they weren't getting Donkey Kong (although some execs probably did when they saw all the Donkey Kong posters in Rare's headquarters).
Bishop73