I am also going to say P.c.affinis (Sonoran Gopher) but it is imposible to tell without a full body shot. Even if it is, saying bull wouldnt be too far off for they do intergrade within natural, wild conditions(most of western New Mexico though not the central part of the state and I belive eastern Arizona). Also, if the animal in question is a juvi or smaller, it may be too hard to tell because of the age. My juvi male bull's head looks very much like a gophers but he is no doubt a bull. As sayi(bullsnakes)grow larger however(this can even be said for pinesnakes)their heads bulk up alot.
Just my 2 cents.
J
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