Race models often have different textures defined that can be set to display different appearances. Chokidai may be one of them. Bears use the same 3d model, but different textures for black, brown, and white (polar) bear NPCs, for example.
Not sure about the change submission. If it's a bug fix that makes EQEmu behave more like EQ Live, then it gets added to the master source. If it's a customization, it does not get added to the master, you simply keep it in your own code, generally as a branch forked from the master.
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