Yeah, being a drummer I can also say that Danny Carey and Mangini are different types of genius. Danny is an absolute master and I've seen that Pneuma drum cam I don't know how many times, and can't avoid seeing it whenever it pops, too perfect. What Mangini normally displays as default technic is quite different from what Danny does.
That said, I would say Mangini would figure out Pneuma verses faster than Portnoy. He even said it either on the video or comments on posts that he IS NOT a stellar writer of music sheet, like academically, which Mangini is! And that's okay, Portnoy is also another different kind of genius, he can play anything, displaying amazing technic, great personality and groove. What he did to Danny parts is exactly what I expect him to do with MM songs, not necessarily replicate the amount of singles Mangini can play with one hand at the intro of Pale Blue Dot, but playing the song in a creative and musical way that only he can do.