This notion is, frankly, laughable. There was as large a difference between the armies of the different Warring States as there were between the different Hellenistic kingdoms. Zhao, Yan and Zhongshan all practiced quite a different way of war from, for instance, Qin, and Chu, being such a large empire, differed from, and influenced, many others. This is also not considering "non-Chinese" groups like Ba and Shu, the Yue and Nan Yue, and the later formation of the state of Dian.
If the game were to start around 272 BC, the different factions in what is today China would be about as diverse as the EB factions of the eastern Mediterranean - that is, the basis of the armies were fairly similar to one another, but they all had enough variety to keep them very much differentiated.
I can just see a bunch of Chinese people working on a Hellenistic mod sitting around and saying "it's all just a bunch of Greeks! doesn't look like there would be much difference between them - all phalanxes and cavalry..."
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