for all intensive purposes they are the same chemically.
you can tell that a marketing type wrote that, or a technical person thinking they were a marketer.. not sure how the "WRO" bioD can posess more units of energy than SVO derived bioD, if it did, these guys disproved the laws or thermodynamics. another way to look at it is that the supreme costs more to make than the imperial.
the only predictable difference would be the amounts of free acids and water, which are always present. iirc, on infopop, the conclusions were that the virgin basestock bio less chance of unknown nasties remaining after reaction since it was unused oils. that and the exhaust smell would be consistent from tank to tank.
dp