no. I noticed that the McDonald's in my area where more expensive than the next county (orange.county). they have different pricing by a couple of cents. I noticed that as well on jack in the box, taco bell, and even wal-mart
Often one management company owns multiple stores in the same area. Those stores will definitely have the same pricing (or very similar). Stores that are in the same area, but with a different franchise owner can vary in pricing (and coupon acceptance).
It would matter if it is owned by the corporation or if it's owned by an individual who still has to go thru training before they can buy one. Might depend were they get there product from. If they are a border town they might get there stuff from the state next to them if it is closer than getting from in state. For example there is a town in New Mexico in which they name brand grocery store one on the west side of town and on one the east side of town. The one on the west side gets the stuff out of Arizona and the one on the east side get there's out of Colorado the one out of Colorado is cheaper same items it does not cost as much as it dies coming out if Arizona.