I've used Boston Butts before for pulled pork. Can I use a "Pork Shoulder Butt" ? The "butcher" at Costco told my wife it was the next cut from the Boston Butt. If I can use it would it be much different in terms of texture or flavor? I'm preparing pulled pork for my son's graduation (his request) and don't want to dissapoint 30 newbies to low-n-slow cooking.