Again, I must stress, severe "Broken Age" spoilers.
I've finished Broken Age (Act I) by first playing with Vella, switching to Shay near the end, and after finishing with Shay - getting back to the last few puzzles with Vella.
When I've finished with Shay - the game ended with Shay fainting on the outside of the ship. When I've finished with Vella - the game ended with Vella fainting on the beach, and then meeting Shay and 'switching places' with him. If I would've finished the game with Vella - would the game ended with her fainting, and the final sequence appearing only after I've finished with Shay?
Would the final sequence be different in any way?
(Just to be clear - this is the ending sequence I've seen)