Dress Shoe Sizing

Buying my first pair of dress shoes so I went to a Nordstrom to use a Brannock device and find my shoe size. The device said 9.5 so I tried on a derby 9.5 in their house brand. If I was purchasing say Alden used or Allen Edmonds used would I also go 9.5? I would probably be looking at a derby as opposed to an Oxford.

Also, when matching color to my belt, do I just use my best guess if I can’t view both leathers in store?
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