Photo attached, not sure it helps as my cheap Motorola phone does not work too well under CFL bulbs.
Left boots both size 44, Journey on the left, Rainbow on right.
The Journey seems to have 2 or more cm in each dimension. Also, on the Rainbow, the Goretex sock is attached to the leather upper. In the Journey, the sock is not attached to anything at the front meaning it is more flexible. The front of the upper completely folds back on itself, allowing easier access.
Also, the distance from the sole to the upper above my instep is greater on the Journey. There are red Keis heated insoles fitted inside the Journey but they are still roomier, allowing thicker socks.
That’s great! Thanks very much, really helpful.
Looks like they’re worth a try.