Differences among the same speicies is usually more noticable North to South than East to West at least physically.
There are two rules that address these differcences.
(a) Bergman's rule - the body size of varieties increases with decreasing mean temperature of the habitat. Example: the ideal shape to be in the Arctic is a sphere.
(b) Allen's rule - the relative size of exposed portions of the body decreases with decreasing temperature, i.e. nose, ears, toes, extremities will be proportionately smaller.
Bergman's Rule is easily noted when comparing animals of species such as White-tail deer, Black Bear, certain species of birds.
I think this could/would extend to coyotes as well.
Behaviorial differences between coyote populations should not be closely associated with East/West geography. As mentioned thought, behavior could greatly be altered due to increased human populations, increased coyote populations etc.
I doubt that coyote behavior could be proven to be statically different if looking at an urban coyote population around say Los Angeles or Las Vegas, as opposed to an urban population around Washington D.C. or Atlanta.
While there may well be differeces in behavior between coyote populations, factors other than Longitude will be responsible.