Changing a/b in publication by same author in one journal
I am citing 2 pieces by the same author from a forum held in a journal.
Pun, Ngai. 2020. “The New Chinese Working Class in Struggle.” Dialectical Anthropology 44 (4): 319–29. https://doi.org/10.1007/s10624-019-09559-0.
Pun, Ngai. 2020. “Reply to the Forum Commentaries on the Article, “The New Chinese Working Class in Struggle”.” Dialectical Anthropology 44 (4): 349–53. https://doi.org/10.1007/s10624-020-09598-y.
As you can see, the article "The New Chinese..." goes earlier in the publication than the Reply. However, when I add the citations in the text, the former appears as "b" and the latter as "a", following title order instead of pages. This produces an awkward (Pun 2020b; 2020a).
I would like to have this reverted, following the page numbers, but I can't figure out how.