Rabbi Shimon says: lambs precede goats everywhere. One might think this is because they are choicer; therefore the verse teaches, '[And if his offering be a goat] and if he brings a lamb as his offering' [showing the lamb mentioned alongside the goat], which teaches that the two of them are equal. Turtledoves precede young pigeons everywhere. One might think this is because they are choicer; therefore the verse teaches, 'and a young pigeon or a turtledove for a sin offering' (naming the pigeon first), which teaches that the two of them are equal.
Sheep and Goats Doves and Pigeons Weighed Equal in Offering
Yalkut Shimoni on Torah 4:3
רַבִּי שִׁמְעוֹן אוֹמֵר, כְּבָשִׂים קוֹדְמִים אֶת הָעִזִּים בְּכָל מָקוֹם יָכוֹל מִפְּנֵי שֶׁהֵן מֻבְחָרִין תַּלְמוּד לוֹמַר (וְאִם עֵז קָרְבָּנוֹ) ["וְאִם כֶּבֶשׂ יָבִיא קָרְבָּנוֹ"] מְלַמֵּד שֶׁשְּׁנֵיהֶם שְׁקוּלִים תּוֹרִים קוֹדְמִין אֶת בְּנֵי יוֹנָה בְּכָל מָקוֹם יָכוֹל מִפְּנֵי שֶׁמֻּבְחָרִין תַּלְמוּד לוֹמַר וּבֶן יוֹנָה אוֹ תֹר לְחַטָּאת מְלַמֵּד שֶׁשְּׁנֵיהֶם שְׁקוּלִים.