Different ones, Micheal has renamed his seedling to Madeira Verde and it has been reported common. I have that one too, I have not fruited it yet. It has a really nontypical Adriatic leaf shape.
The White Madeira #2 that I got was from a collection in Illinois, Saw it very briefly mentioned a couple times on video. But part of my point is that it is a White Madeira named variety that was offered in public sale. I got little information on it but was able get the understanding that the timelines don't align to it also being Micheals variety.