It seems to me, this could be a possibility to explain the different fullers, the slightly curved blade and also the probably reshaped tip. Accidentaly also some of the decorations at the base of the blade are similar.
A couple of links to similar blades:
http://anthro.amnh.org/anthropology/...70.1%2F%207745
http://anthro.amnh.org/anthropology/...70.1%2F%209197