But interestingly, Vortec, LT1 and LS engine equipped cars and trucks are included under the same part number.
just because a chinese knock off universal maf sensor says it works with 100 different vehicles, because their only qualifier is that it fits/starts/runs doesn't mean that all 100 vehicles actually have the same maf sensor with the same calibration curves.

rockauto is great for finding cheap parts but not necessarily the right way to ensure fitment of a critical sensor like a maf. they run cross reference chains to universal fit stuff and back in both directions to ensure the greatest amount of bottom-of-the-barrel cheap parts show up in the list.

a vortec or LS1 maf is definitely not the same with regards to airflow vs hz output and if this is a car you're actually tuning you need to totally recalibrate to that new maf