Stock VS. aftermarket widefronts

-I was wondering if the Schwartz and the Noorden when pretty similar as for as the axle tube goes. I have a Noorden on my 656 and I do not like how they have the spindle shafts setup for the steering arm to attach to them. On mine they used a key style shaft and arm. On the Schwartz that i have seen they use a spline shaft and arm (which would be alot stronger in my opinion). Thus being said, I was wondering if I could take a Schwartz spindle shaft with the splines and the splined steering arm and put it on my Noorden, look to be around the same size tube from seeing pictures.

-I was also wondering about the stock IH wide front axles compared to the Schwartz. They both use a splined spindle shaft and steering arm. I was wondering if the size of the 2 is the same, again they look pretty close to being the same in pictures, other then the Schwartz steering arm seems to be a little different in shape.

-With all this being said, I want to switch my Noorden spindle shaft and steering arm with either Schwartz or stock IH ones. Mine are getting sloppy because of poor design using just using a half moon key for the steering arm and shaft.....