Very nice find.
Regarding differences. This serve below is a high level technique, not a reverse slice. It is also to the deuce court not the ad as the Rosol server. Compare angle of ball trajectory, hand path and racket head path for both type serves.
Comparing a serve in the deuce court to one to the ad court is not the best comparison. Anyhow,
Notice for the usual high level serve:
1) Hand path angle to the right of the ball's trajectory.
2) Racket path is to the right - less than the hand - and the racket head rotates clockwise as viewed from above.
3) The resulting ball trajectory to the deuce court target.
For the Rosol serve:
1) Hand path more toward the ball than the serve above.
2) I believe that the arm does pronation plus ISR, in some unknown mix, need better video.
3) The resulting ball trajectory to the ad court target.
I think the different hand paths are important and are not often considered for serves. The rare above camera view is very useful for showing these paths. (I think the same thing for the Waiter's Tray technique.)
I don't like to use what I do for the reverse slice because mine is slow, but I rotate the racket head the same way and go across the ball's left side. The racket head rotation is similar. Hand more at the ball not like the standard high level serve shown above. My reverse slice has little pace but the bounce gets mistakes. It is especially good after the returner has nailed two returns. I use it maybe 3 times a match so that the returners of my club won't catch on. Sometimes I get a mild golfer's elbow injury pain when I do the reverse slice.