On the anthology, there are a few tracks. From my knowledge, it's only on the Empire Strikes Back tracks on Disc 4
The "Leia's Instructions" half of track 6 "Drawing the Battle Line/Leia's Instructions" is reversed which starts around 2:07 until the end.
One of the cues from track 17 "Carbon Freeze/Luke Pursues the Captives/Departure of Boba Fett" at 7:33 until the end.
"Luke's Escape" from disc 2 also cuts off a few moments of the harp gliss leading into the cue.
And some of the cues are different takes such as "City in the Clouds."
On the Special Edition, the cues with flipped horn's are:
02 "Main Title" (the entire track)
there are a few others, but I'd have to keep looking... most of the tracks on the SE are so narrow... and badly mixed... that it's not just a problem of the channels flipped either... it's also the mixing. They overly mix the synth and other background instruments into the mix so they are loud and too present... more so than they should be. Compare tracks like "Wompa Lair" and "City in the Clouds" with how they are used in the film. The synth/choir as sooo present. I didn't even know they were there before I heard them on the album lol...