They are, their ranges overlap each other in certain areas. The Mexican and the western are called 'Plains' hognoses. They both are similar but pattern changes, color changes, and scaling is slightly different, but not drastically. Some even interbreed and make babies that look alot like one or the other in the same clutch. Pretty cool but some people hate these 'mulatto' type hognoses. I call them multi-racialLol
Great pattern on him for a western. Congrats!