I think your air cell will be fine. ( your chicken eggs appeared to have extra large cells most likely due to shipping) If you use humidity similar to what you use for chickens, your muscovy hatch should go fine. When I hatched Muskovies the first one hatch on day 35, but the last one hatched day 38. Ducks seem to require even more patients than chickens.
Update non of my duck eggs hatched they were all fully formed and airsack looked about right at the end. I guess they all died before they hatch well I won’t be attempting Muscovy duck eggs in the incubator again. It wasn’t all bad though my shipped eggs with the crazy looking air sack hatched, I was very surprised. The ones that developed hatched, I threw out two eggs that had development in it. I didn’t see any blood vessels in them like I did the other four so I thought the chicks died, around day 14.