Generally speaking, the answer is no. Taken to the extreme there might possibly be some issues, but not very likely with any kettle a home brewer might use. The main thing that various kettle diameters will affect is the boil off rate. More surface area results in more evaporation during the boil with everything else being equal such as the amount of heat applied and all that. You only need a moderately vigorous boil to take care of the DMS. I boil a little harder and longer when using pilsner malts for this reason.