Established manufacturers are aware Americans require more room--the differences come from the place ergonomics has in their design process.
Comfort, ease of movement and visibility are important for the North American manufacturers and those who really consider NA to be their 'bread & butter' these days.
I'm 6'3'--down to 200# from 255#. One side of my 3520 could accept two of me--the other I have to slither around the loader controls-which is much easier at 200!
Back in 2005 John Deere was leading the pack for getting into the station without hitting anything--it really worked well for their sales, and seemed to really kick off a lot of creature comfort planning. Back then the similarly sized Kubotas, New Hollands, Kioti's and Mahindras felt tighter--and more cluttered. Lots of shifters, knobs and pedals--narrow entries.
A friend bought a bigger Kubota 2 years ago with a cab, bluetooth, AC, heat, stereo system, area light, adjustable draw arms, and two force configurations for the loader attachment--bells and whistles as options that weren't considered for a CUT a decade ago. I can jump right in there now--nothing is in the way anymore.
I know 'fit' has been high up for manufacturers for a while, is what I'm getting at. It impacts sales to restrict your target audience to certain dimensions.
I'd try all of them out and get a sense for real-world conditions--up & down for log pulls, implement adjustments, checking for 'mines'. Jobs where you're up and down all day to keep them going.
JD made ergonomics a critical design aspect for longer than any other manufacturer--the benefit of living in the same nation as OSHA and carpal tunnel syndrome.