Let's think about why is Jess half Asian.

An Asian historical would ahem probably have no bangs, and black hair. If Jess were totally Asian, she'd either look exactly like AGT 4 or that.

So why do they need to distinguish Jess from that, by making her only Half Asian, using a different face mold from AGT4, and giving her auburn hair?

Because she'd look exactly like an Asian historical if they didn't, diluting the uniqueness of both?