Personally, I classify ~~ 100mm width boots as medium fits. There are a lot of good ones and each varies in detail. That is, one might be 1 or 2mm different than another in one fit area or another.
Bottom line here is that you absolutely cannot quantify a fit category by the forefoot width alone, there are too many other variables. You need to connect with a quality fitter and experiment with various boots within each fit range.....then work with the one that is best in order to gain the best fit that is reasonably achievable.