The total voice leading between sets X and Y is defined as the complete collection of ordered pc intervals formed between the pcs in X and the pcs in Y. These interval multisets (imultisets) describe the sonic signature of the motion from X to Y, and they always have the property of transpositional combination. In some cases, the same total voice leading may be produced by different pairs of X and Y (Cohn 1988 refers to this as “multiple parentage”). In such cases, the total voice leading may remain the same even though the generating chords differ.
Straus, Joseph N., "Total Voice Leading" (2014). CUNY Academic Works.