Countries such as Cuba, Latvia, Lithuania, Croatia, Vietnam etc with their own frogs/modifications etc.
Very nice examples of these two variations, just like mine! It does look like you added a Russian hanger on the brown one. I would suggest replacing it with a short East German, (DDR), one to be correct. Who ever made these bayonets up used new unissued surplus DDR scabbards and hangers assemblies. The black scabbards would be correct with either a short or long hanger depending on if the were assembled for use with the DDR AKM 6X3 Type I, (transitional) or the AKM 6X4 Type II bayonet. This can be somewhat determined by the molded marks on the scabbard, early vs late. Mike