The Chrome has a thicker toe and upper and the toe is made from a heavier material. There might be a difference in the ankle/shaft material but I'm not sure. The footpad/inner soles are close enough that I couldn't tell the difference. I never had issues with the ankle or interior sections of those boots so I didn't pay them as much attention.
The sole and lacing (BOA) systems are identical for both so those parts are interchangeable.