Like LC says, Chinese are the only ones to have experimented with differing lugs. Everyone else pretty much used the std. long lug from the original Russian design.
Long Threaded lug: Early Chinese, all Albanian, all Romanian, all Yugoslavian, all Russian, all East German, all NVA (likely early Chinese), North Korean (some with a somewhat modified tapered long lug)
Short Threaded Lug: mid to late (1964 to 1984) Chinese, varying factories.
Pressed & Pinned Lug: late (post 1970) Chinese, varying factories.
You will also find Chinese long and short lug barrels that have been retrofitted/refurbed to become pressed and pinned barrels with pins securing them in place instead of threads.