 For example, the C major scale, G major scale, and the major scale in all keys, are not identical but share transpositional equivalence in that the size of the intervals between scale steps is identical while pitches are not (C major has F while G major has F).The major third and the minor sixth are not identical but share inversional equivalence (an inverted M3 is a m6, an inverted m6 is a M3).A melody with the notes G A B C is not identical to a melody with the notes C B A G, but they share retrograde equivalence.