So it seems they're pretty much unchanged...
Don't worry, Walt. I have half a dozen MkIII nickel Feadog Ds which look to me to be identical in all respects, but I swear that my favourite one sounds and plays better than any of the others. The design didn't change, but there is certainly some small difference in sound, and maybe feel, between individual whistles.
I'm pleased with the Trad.
Which Cnat do you guys use on it? oxxooo sounds good to me on this one, which makes a change. On many whistles I blow that fingering a tad sharp and have to add fingers.
Breath control... I'll have to learn that one day