C Eb G Bb D F A would typically be notated Cm13. However, it makes a convenient example for this question.
Suppose I want to write that same Cm13 chord as a polychord. I have two choices: BbM7/Cm or Dm/Cm7. Would the choice of spelling have implications for the voicing of the chord or the musical meaning of the chord (such as harmonic function)? Or would either one simply be taken to express a set of notes to be played in a certain presumptive bottom-to-top order (i.e., as equivalent)?
There are other interpretations of the notes in the chord. It could be revoiced, for example, as F/EbM7. For the purposes of this question, I'd like to stay out of the weeds of all the different ways an unordered set of pitches could be written as a polychord.