Ehm, now it becomes a little bit to special for my english abilities and my dictionary failed to help to interpret your question. But i will try to answer. (I hope that i have understood your question correctly.)
This picture i have taken from the site you mentioned above. The upper folder is the GDR made. In the GDR the Kashis were made by the system Wieger. Wieger 910 was the AK-47 series, Wieger 920 was the AK-74 and Wieger 940 was the Assault rifle in NATO caliber.
In each Wieger family you had a version with a butt, a version with a folder, a version as light MG and a short version. Interessting are the first two, because the weapon was so designed, that you could exchange a butt with a folder and vice versa. Butt and folder had the same "holding system" (is this the correct english term?) to connect it with the body of the weapon.