Then yes, those pieces can be swapped, meaning what fits on the regular Mk85 will fit on the BD as well. I don't have a picture for you, but I do have the BD neck piece (as well as other parts from the BD MK85) to use on my regular MK85, so I know it works/fits and that pretty much every part is interchangeable between the two figures. Hope that answers your questionI think I worded it wrong, I should have wrote collar piece and not neck piece
I'm specifically wondering if this part can be swapped:
Since the regular mark 85 has a very clean look which makes it look better when he has the helmeted look:
The collar piece it comes with looks really good if you're using the Tony head sculpt, but if you plan on using the helmeted head it looks a bit weird IMO.
What Rory has from the aftermarket collar piece is what I'm looking after