the red or green 人仔 are early model. It is made by HPI, the white one is mid model which you need to paint yourself. The latest one should be grey, black and white.
No, they all have same 人仔, it is just when they which 人仔 in stock they will put which 人仔 in the box. But they will not include the red/ green 人仔 anymore as they do not purchase it from HPI anymore.