It depends on which Alden last you're talking about. Unfortunately, it's not that simple. This might help: http://thediscoursecircus.tumblr.com/post/13493575455/the-last-shall-be-first-deciding-which-alden-size
Have your foot measured on a Brannock device to determine your US size and then go from there. For comparison, I wear a 9E in the 348 last (C&J). In Alden, I wear a 9.5D on the Barrie last. Now, US width measurements differ from UK (although all UK manufacturers don't use the same standard, either). A "D" is Alden's medium or normal width, whatever one calls it. The Barrie last is also considered to be one half size bigger. For reference, I measure somewhere between a 10 D or E on the Brannock, but find the Barrie last to be wider than it claims so an E width would be too wide for me.
What size are you in C&J and on what last? Also, shell cordovan runs a little bigger in fit than calfskin, but also won't stretch like calfskin..