Specifically, calf size?

So, I just saw these:
http://piperlime.gap.com/brows.....38;mkwid=s

The thing is, they look to be almost exactly the same basic boot as the NAS ones, which I couldn't zip up in the calf and were a bit big in the ankle (but sometimes zipping it all the way up will fix the ankle somewhat). They just have a different heel and buckle detail.
http://shop.nordstrom.com/s/mi.....=michael_m

Piperlime lists the calf circumference on the Hamiltons as 14.5 and Nordies' has the Arley at 13.5" BUT we all know how inexact these measurements are, especially across different retailers.

So what do we think? Are the hamiltons worth a try, or am I just setting myself up for failure?

By the way, the Corso Como Enricas arrived and I could not zip them up. There is absolutely no give (no goring or anything) in the leather.