The comparison between two cophonicity values, obtained considering distinct atomic couples embedded in two structures with different connectivity, will provide meaningful information under certain conditions. For example, C p h (Mo-S) in molybdenum disulfide bulk and nanoclusters, despite calculated in the same frequency range, could refer to distinct sets of vibrational modes; this is due to the distinct topologies that, in turn, determine different electronic environments. In this case, any change of the cophonicity by means of substitutional defects could lead to non-correlated changes of the vibrational frequencies. However, if the two structures with distinct topologies are connected by continuous geometric transformations, also the electronic environment of the atomic pairs, thus the vibrational frequencies and the associated modes, are related by such continuous transformations; in this case, the cophonicity of a specific atomic pair in one structure can be mapped into the cophonicity of the second one, granting the transferability of the definition, hence the reliability of the cophonicity comparison.