Currently none of your pictures are working.
They appear as if they are. Only way I could tell for certain is by carefully inspecting the disconnector sear. OD green was not on all packs. The full auto packs can be modified to look exactly like a gen 1 semi auto.
The front sears I've seen are black looking to me, is that common? Is there any difference in the od green sear and the black one?
There are several different colors of the front sear.
FN made a run of packs with different color parts that kind of changed things.
Generation 3. You can tell by the higher cut notch on the hammer that engages the auto sear. Gen 1 and Gen 2 hammers will engage the auto sear when the hammer is in the rearward (cocked) position.