Good morning all...

One of the easiest ways to tell both aircraft apart is by their tails. The "Buff" has a "T" tail and the "Bou" has a "Split" tail. There are many other differences but that is the easiest way I found.
Cheers...Happy Landings...Doug
Sound, Doug......the sound..........you know the radial noise.........that and the tail are the dead giveaway..........I fondly remember a hop around the Bay of Quinte as a Cadet, in the mid 60's on a Caribou.........I thought the windows were going to pop out of the frames along the sides of the fuselage.........got my hands on the wheel in the right seat for a few mins too, but the best was the very short landing at Trenton.........ah, memories......... 8-)