…any real difference… we are not talking about a quantitive difference, one of more or less, but rather about a substantive difference. The only such difference is in their Yesods, as the proposition goes on to state.
...this is found only in the lights that are involved in the channeling... For each light functions according to its purpose, and its form is suited to its required function. The function changes according to the change in the form in which that function is rooted. Since different influences have to be drawn down, the lights involved in the channeling of the influence have to be different, which is why it is in their nature to draw down a different influence.