This is completely random, a bit obvious, and likely old, but "Cocoon de Chocobo ~Let's Have a Dream II~" from FFXIII is based exactly on "Let's Have a Dream" from Chocobo's Mysterious Dungeon. Who would've thought, right?
This "discovery" came from winamp randomly playing the original CMD version and me thinking, "hey, I've heard that before..."
We know that Yamazaki arranged the FFXIII version, so I wonder if this means Hamauzu didn't contribute at all to the "new" arrangement? Or whatever you want to call it--it's an arrangement of an arrangement of a variation of the chocobo theme.