I bought the 9011 Beckman and the Brogue Iron Ranger about a month ago. I wore them both today for a half a day with the same thin sock. I think the beckman is slightly larger in both length and width. I am about an 11 in most shoes but always 10.5-11.5. I bought both in 11 and they only come in a D width. I feel like the Iron Ranger fits my foot more comfortably particulaly the shoe bed. I think the ranger is not quite as wide or as long but not hugely different - just a little smaller. I feel like in the Beckman I may just get a heavier sock or an insert. Things are a little loose but not crazy loose. I think the Beckman is a bit thicker and better leather. I get lots of compliments on them.
I love both and am happy I got both.
I do think there is a difference however in fit and thickness of leather. In hindsight I could see going down a 1/2 in the Beckman, but would probably not do so in the Iron Ranger. Hope that helps a little.