@TtownMD - this is hard to say, because the lasts are pretty different. I'm usually a standard US D width across the board 9.5US, though I do have a narrower heel. I have a normal instep and I prefer the toebox to have extra room. The 946E is closer to the standard US D width in my opinion, due to the wide heel cup and the high instep of the 946F. The toebox could use a bit more room in the 946E, but its manageable for me. 946E would be perfect for me with a wider F width toebox, but with the 946E heel and instep. To me that version approximates a more standard D width.
That being said, to your AE question, I fit a 9.5D park avenue, but the fit isn't great because the toebox is too tight and the heel cup is too loose. 10C park avenue fits slightly better at the heel, but is a bit loose overall, though I have better toebox room. It isn't a great last for me. I don't these lasts have a lot in common to be honest, so not sure if that helps. I haven't tried B width, so I can't speak to that.