That is likely the difference. Despite being largely the same airplane there are a couple significant differences between a Cherokee 140 and an Archer. First is wing design, second is stabilator dimensions. The archer flys largely like a skyhawk, the cherokee 140 does not. Airplanes fly like airplanes, but there are some subtle differences that you'll need to learn as you transition from one to another. The more types you fly the easier the transitions become.