They probably changed it to have a snugger fit; however, that doesn't mean anything and is more for marketing than any real benefit. It's the joint facing that transfers the energy from shaft to butt and that's why people's largest preference deals with joint Type and Material, i.e. wood to wood, flat faced, insert, etc... Those are the things that affect feel.Thread pitch maybe?
Someone would have to use a thread pitch gauge to determine.
Jaden