I have this passage listed as coming from 12.4 (chapter 12, section 4) because that is the chapter and section of Tractate Shabbath from the Mishnah that this Talmudic passage is commenting on; also, I think that is how Neusner does it in his translation.
However, I have also seen this same passage paginated as 13d, which I think (?) maybe means it comes from the fourth column of folio 13, because apparently the Jerusalem Talmud goes by fours rather than by twos as we find in the Babylonian Talmud.
Moreover, though, on Sefaria I have found what appears to be this same passage, after a bit of searching in Hebrew with no English help whatsoever, straddling the juncture between 70a and 70b, the pagination on Sefaria for this Talmud not even including letters c and d; rather, this pagination system on Sefaria resembles the Babylonian system, with a and b going back and forth.
Does anyone know how these various systems work? Is there a comparison table somewhere that can be consulted to convert one to the other?
Thanks.
Ben.