I want to buy a pair of RMW boots, either the Turnout or the Craftsman. I understand the Turnout is more of a rounded toe, while Craftsman is chiseled. However, on nungar, there are 2 options for the same boots it seems. For example, the Turnout is listed as NTB530Y and RMB530. Is there a difference between these? I'm also worried about the sizing. I've worn sizes from 11 to 12. (Even 13 for puma sneakers). What can I do to insure proper sizing?