Thank you. I have a fairly wide forefoot and high instep. I'm quite pleased with both. The 74945 has a little more volume, particularly at the tongue near the opening and is has a touch less room at the forefoot than the 946. The 74945 also feels a little narrower at the heel. My favorite last is Carmina's Rain last and the 946 feels just like the Rain but is just a skosh longer. The 74945 feels similarly but a little more volume, particularly in the instep, and in general feels a little more relaxed. I haven't worn either of them for very long, but the 74945 just feels like it could go longer in the day before my feet start to complain. All things considered, both shoes are the finest in my collection. The EB dress shoes actually makes me excited to wear a black shoe.
Thanks for the detailed description. Did you wind up taking the same size in both?