Well, all's I know is, I have a tort sold to me from a very reputable fragger as a Shuan Bennet Tort (SBT). I also have a tort I bought as at an LFS as a frag on the ORA frag plug as the OBT. They were positioned about 24" from each other in similar elevation and flow conditions for years in my old tank and both slowly grew. At several points I'd say they looked similar and then, at other points, I'd think they looked different. For the most part the SBT has been every so slightly faster growing, lighter in depth of color and not quite as thick as the ORA coral with finer coralites.
I recently moved and took down that tank and have all my SPS in a holding tank for now. Both torts have grown at insane rates since this move (why is a mistery to me) and look very, very similar at this time.
In watching this recent growth and move toward similarity, I have been convinced they are of the same original stock and that the subtle difference are light and flow induced and little more. The quote posted by Dejavu references a Shuan and I am assuming it is Shaun Bennet. I think that seals it, they are the same coral from different sources.
But I do love em both!