TT #57 · Parshas Tazria · Aliyah 1 · Passuk 8
English: If, however, her means do not suffice for a sheep, she shall take two turtledoves or two pigeons, one for a burnt offering and the other for a purgation offering. The priest shall make expiation on her behalf, and she shall be pure.
Chabad.org — Chumash, English translation + Rashi for Vayikra 12:8
Torah Temimah cites Zevachim 90a for the significance of the order in which the two offerings are named.
E-Daf — Zevachim 90a · Shas.org · Sefaria — source text and translation
English: “One for a burnt offering and one for a sin offering” — Rava said: according to the wording, Scripture placed the burnt offering first.
Textual order
The verse’s sequence is the point of the derashah: it names the burnt offering before the sin offering. The claim here is about scriptural order, not that the two offerings are interchangeable.