Regardless of the difference, the dogs are not fit for purpose if their work is causing them injury. The fault lies in the breeding, but docking has enabled people to bypass that.
Breeders should step up to the plate and deal with it properly.
Interesting that you should say that. In the past I was quite particular about it, but my current best sheepdog is of completely unknown parentage. I bought her (for a not inconsiderable sum) purely because I liked the way she worked. Which is the only thing that matters really.
So I'll claim that pint off you one of these days