According to Don Perry, the BGM composed by Bob Summers weren't given titles. The names of the pieces on The Full Moon Collection were most likely chosen by the Koch Records team while producing the album.[1]
"Tuxedo Mask", as it's presented on Sailor Moon: The Full Moon Collection, is only 1 of 3 major Tuxedo Mask themes. The longer versions of these themes have never been officially released by Bob Summers or E1 Music, but some were archived.