Yes genetically they are the same but any one who deals with working sport dogs knows that pedigree makes a lot of difference in dogs. Are there some GSP's that still retain the natural ability and drive that they were breed for, I am sure of it. However the odds of getting a dog from the average AKC litter that will perform as well as a dog from an average DD litter is much less. It is a simple matter of breeding standards and controls. It is very well proven that breeding practices and pedigree make a huge difference in the quality of animal produced.
* (Swinging club) Whack! whack! whack! *
Nope, the old nag's still dead .