The reason HJ Sandman brochures show both Holden and Kingswood trim is the Sandman option package was available on both Holden and Kingswood vehicles. Simple.
In early HJ 60V is the code for Beige on a Holden and Chamois/Covert on a Kingswood. Later in 1975 the Beige bench seat code changed from 60V to 60W but buckets stayed as 60V. For the last of HJ the light trim code changed to 60A, called Beige on Holden and Chamois/Black on a Kingswood. Not so simple but pretty clear. The difference between beige and chamois is the vinyl used on the seats and doortrims. Beige is a single tone vinyl, chamois is a two-tone. For the blacks GMH actually gave the single and two tone vinyls a different code: 19V is black (this is the single tone black on a Holden) and 18V is slate black (this is the two tone black on a Kingswood). But for the other codes, ie 60V/W, 45V/W and 67V/W they didn't.