Not quite the same thing but similar in concept: Jonathan Stroud did this nifty thing in his Bartimaeus Trilogy, where he had two main characters, Bartimaeus and Nathaniel, the former being the narrator. So, all chapters that focused on Bartimaeus were written in first person perspective, and all chapters focusing on Nathaniel were narrated by Bartimaeus in third person.
Andre Norton used it in the Crystal Gryphon trilogy. She headed each chapter with the narrator's name so that you knew who was talking. I had never seen that before, so it confused me a bit at first, but I liked it once I realized what was going on. I liked being able to get different people's perspective on the same event, and it was interesting to see what the characters agreed upon and what they differed on.