Kindjals, Quamas and Quaddaras

[Miguel]

Hi everyone,
I would like to pose the following questions.
1-When is a kindjal a Quama or Quaddara or vice versa ?
2- How can you tell the country of origin ?
3- Why do some blades have a flat diamond section devoid of fillers while, what appears to be the majority, have a deep central fuller on both sides ?
The reason for the questions is that I have a number of these weapons which I am hoping to research.
Regards
Miguel