Your first M9 is definitely a Chinese manufactured copy. To the best of my knowledge, there are no Japanese manufactured M9 bayonets. An easy way to spot these is by the blade stop on the face of the cutterplate. Take a look at it from the back side. It is held in place with a hollow rivet. I don't expect that the stop would remain on the cutterplate very long under real use. Take a close look at the bottom of the crossguard. I can't remember if it's on the front or the back, but the early bayonets were marked with a 6-digit number like 96xxxx. It's not very large and easy to overlook.
Your second bayonet is a commercial Buck M9 manufactured in 1994.
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