727 Expert Needed

oldkimmer said
U r likely getting an over drive slip yoke. Splines are cut on a different angle. Kim

Thanks Kim
So would a od yoke fit on a 833? The first yoke I bought online said it was specifically for 727, IIRC, 66-75, the second came with my drive shaft I had built and told them it was a 72 model.
What are the chances???