Thanks. I just checked the "Glory" tape and all the music is renamed for the movie. I don't know if it's a remake or I was wrong where the music originated from.
The Glory soundtrack (by James Horner) does sound very similar to Carmina Burana, particularly the "Charging Fort Wagner" track. It is very understandable to confuse the two.
Carmina Burana is probably the most often imitated classical piece in film scores. Others in which I have found a similarity are The Last of the Mohicans ("Massacre/Canoes"), First Knight ("Arthur's Farewell"), Conan the Barbarian ("Battle of the Mounds"), and Matrix Revolutions ("Neodämmerung").