Updated: May 6
If anyone here wonders why the AK type rifles are named differently, my colleague Grigory lists down the main types in his article on the Firearm Blog.
As English and Russian are not languages spoken by the ordinary layman in the region, the people fielding these rifles came up with names to differentiate between the various types of rifle they encountered. These names inevitably came to spread across Pakistan and Afghanistan and are now referred to as such up to this day. Of course, the few with real knowledge would use the correct terminology, however the proliferation of those incorrect names are too deep set to change.