vey... The longer head tube on the Raleigh is because it's a taller bike while the head tube angle itself is the same as the Kuwahara.
The things that make them different are the stem and bar combinations they use and if I was to change the stem and bars on the Kuwahara to those used on the Raleigh I would have nearly identical bikes but they do serve different purposes.
I still enjoy a fairly upright and very comfortable position on the Kuwahara and a little more forward weight is beneficial for slogging through the snow as it distributes my weight more evenly...it has been my primary commuter since the snow starting falling.