Bonewidow's color channels inconsistent with Voidrig (wrong channel for skull?)

[RS219]

On Voidrig, Secondary consists of the matte paint markings and chest crest while Tertiary consists of the metallic joints and the skull.

On Bonewidow, Secondary instead consists of the metallic joints. Tertiary consists of the matte linings, paint markings (shield only) AND the skull.

Can this switcharound be rectified? I'd kind of prefer to follow the Voidrig's paint scheme for better consistency.

[NightmareT12]

The thing is the default color for the skull depends on the default color of other stuff, and since not all Necramechs will use the same design, switching it around means the skull can't necessarily look like, well, a skull.