A guy has to hunt coyotes differently in different terrain. More cover and more topography means the coyotes will approach differently than they will in less cover. I really don't think it's anything more than that. If you find open spaces in the east or west, the dogs will respond to the same set design. If you find closed in or hilly terrain in east or west, the dogs will respond the same.
Hunting pressure and human presence based on geography is another factor, but in the same conditions, longitude and latitude is irrelevant. You're just more likely to find a certain condition out east than you would out west, and vice versa.