The NWO was always here in the background, pretending they are separate entities. Doesn't surprise me to see the similarities. They all have the same puppet masters. What's that? Mao went to Yale and Skull and Bones meetings? Whatever, it is all a sham and here is another example of how they are all the same.
There is a far simpler explanation. Do you notice that the ones with knock-offs of everyone else's equipment are always Chinese? They're not mockingly referred to as the "People's Imitation Army" for nothing. Copying foreign weaponry and claiming to have created it is nothing new for China. They have been doing it since the Tang Dynasty.
But you can go with the shadowy NWO conspiracy theory if you like.