Finally, Yugoslavian. Note the two ribs along the bottom, but a full spine. Also, when compared to the Chinese, the lower rib on the Yugo mag nearly touched the bottom plate, while the Chinese is higher.
And of course, the unique follower. Yugo on the left, Russian (and most others) on the right.
Actually, let me add more...
Croatian/Bosnian. Some have what looks like the boyscout symbol
Here are three Russian Izhevsk with the easily identifiable full arrow in the triangle logo below the middle rib.
and an old Russian aluminum "waffle" mag.