Originally Posted by jimmuller

Agreed - try it.

One minor correction though. The crank bolts will always tighten up against something so the fact that they tighten is not an indicator of success. If the spindle sticks out too far through the square hole, not likely, the bolt will tighten against the spindle end but the crank arm will be loose. If the square hole bottoms out against the shoulders of the taper the bolt will get tight but the crank arm will not be seated properly against the taper, and you probably won't be able to tell just wiggling it by hand since the bolt will stabilize the arm. If the hole is smaller than the taper (assuming the angle is the same 4deg for both) then the arm won't go onto the spindle as far as you like, moving the chainline further out and potentially deforming the hole. You can see that problem without having to tighten the bolt fully. If the taper angles aren't the same (check Sutherlands) then it may seem to have tightened but is a bad fit.

And you probably knew all this already.