Many swings and impact positions in golf

The driver and iron swing can be the same, or different, but impact is definitely different. Drivers are teed up in the air and there is more room for error. You can sway, extend and even jump off the ground and hit it.

Iron shots, when the ball is on the ground, tend to fly further and spin more when there is a negative angle of attack or descending blow. The best iron players tend to stay centered over the ball and keep their spine angle thru impact. But, iron shots on a tee, especially with a long iron can do just fine with a level angle of attack.