In addition to the grainy grey finish, M59 bayos are a bit different length from your typical Chinese or Russian blade. I don't have the exact size difference, but I don't remember it to be a bunch, something on the order of 3/8' maybe? I'll pull two out tonight and get you some photos and a real measurement.
As far as the collar, spring, and screw, LC is right the Chinese and Russians are interchangeable with an M59 (minus the specialized ones like the early Russian flat lug version)