OK. I wasn't aware of the length difference... So there's no strength/diameter/wall thickness difference? In the factory they needed a quick visual reference to help them grab the correct part for the car coming down the line, and the length being different would be sufficient to justify the striping difference.
PS. I've never owned a big block... A mighty mouse is more than GOOD!..
but if a car part from a BB car can be used on a SB car, I'm interested..