years back frank falbo confirmed the jazz neck and the full shred neck were not the same wind
This is true. I did this while I was an employee so it can be considered canon. At the time, as well as now, I've always been of the opinion that the company should have the right to trade secrets. Now that I haven't worked there for some years (and to make matters more complicated I work for a competitor) I still believe that to be the case. So what I do is sometimes I confirm (or correct) statements that people make, but only based on information that has been shared before by Duncan employees, whether myself during my employment, or by others.
In this case, yes I had felt it was important to make people know that the FS neck isn't the same wind as the Jazz. But we at some point confirmed that the Full Shred bridge is part of the Custom wind family. And if anything, it's a testimonial to how "dialed in" that Custom wind is, that it can be used for all the Custom magnet swaps AND the Full Shred's very different magnetic circuit, and have such distinctly different and usable sounds between them all.
The A2Pro/Jazz thing was already confirmed, neck and bridge, and then of course that the A2Pro Slash is completely unique, different kind of wire even. That's all stuff we said when it was launched.
For the others, I heard through the grapevine that someone from the company had confirmed the answer on the JB/Distortion/Invader but I have not seen it first hand, so I still remain silent on that. I must admit watching people on both sides of that argument act like they are 100% convinced that they either are, or are not the same wind has me chuckling sometimes. Obviously only one answer can be true, but furthermore passive wire wound pickups have like a 5% tolerance at least. So unless/until someone wants to do what Seymour did back in the day, and physically unwind some coils taking notes at every turn, you can't say you know.

My advice for everyone on both sides is to argue the point like you might be wrong, and be prepared to be wrong haha.