It sounds like you may be referring to different acromion types. This type of thing is just an anatomic variation in bone structure. I have Type II AC joints. This refers to the shape of the bone, not an injury type or impingement type, so it can be a little bit confusing. My acromion are very prominent. It looks like I have a bony bump on the top of my shoulder. I believe it makes me more likely to have impingement or rotator cuff issues.
I also had a slightly winged scapula when I started lifting, but it's been buttoned down as I've strengthened my back. Someone correct me if I'm wrong, but I don't think the winged scapula had anything to do with this.
Here's an image of the different types. Lateral view of the scapula there.