Noticed this aswell, tried to do a comparison but the animations are so fast that I can't do anything with my max 60 fps recordings. I really doubt the model difference can cause such a difference in my perception of the weapon's speed.
A fun thing to do could be replacing the model of the German with the Danish or the other way around and see if you can determine which is the German and which is the Danish based on speed. So you just equip them both, swing both, then guess which one is which, then drop both to check. Do it ten times, if you get it right like 8/10 times there is definitely something there. Sadly I don't know how to replace a change models.