[valiant67]

They might... but more likely they use the VIN to make sure that they get the right parts.

There are many parts that are different between trim lines, and trim lines might not be apparent from badging.

This is very likely the reason. In years past, the parts catalogs used the part's description to identify parts that varied by trim level.
They switched to now use the VIN to determine which trim parts belong to a vehicle.