I think we need to make a distinction between remixes. There's three kinds of remixes:
1. A remix where the beat is completely different with the same vocals. (The World Is Yours, Rocafella, Next Level)
2. A remix where the beat is the same with additional people rapping that weren't on the original version (I Shot Ya, Ruff Ryders Anthem, I Got 5 On It)
3. A remix where the beat and lyrics are completely different. Remixes like these are basically completely different songs but for some reason they are called "remixes". (One More Chance, Street Dreams, Excuse Me Miss)