[Mike O]

With the same trajectory and carry, is the impact between a fade hit by a right-hander and a draw by a left-hander the same?

YES.

1) I thought you were very clear on your starting post that you were comparing a right handed fade to a left handed draw - both producing the exact same shot i.e. trajectory and distance etc.
2) You've answered the question yourself- given the exact same ball flight- then impact conditions were exactly the same - in relation to the ball. If you look at some other context such as the impact point in relation to the player, or the leading edge in relation to the clubhead path, or what the player would need to do to create that shot- well then those issues are not the same.