Therin of Andor wrote:
Kor's people all had his skin tones in TOS.
Actually the ones in "Friday's Child" and "The Trouble With Tribbles" did not. Fred Phillips apparently forgot how he'd done the makeup in "Errand of Mercy" (though he later remembered).
Differences in alien design are differences in artistic interpretation. No surprise that tie-ins to a specific part of the franchise would use its version of the designs.