"The Standard #30 and #40 tapers are not the same whatsoever as the R-8. The Std #30 and #40 tapers use a notched flange to drive them. The R-8 uses a keyway on the side of the taper for driving. They also look very different from the R-8."
Thats what I thought I just came across a couple of posts but I couldn't find anything to back it up. I'm not trying to ask to many questions it's just hard to learn all the tapers and I have never got to see them in person.