An earlier article has compared the perceptual scaling of the Munsell, NCS, DIN, Coloroid, and OSA-UCS colour order systems. This article expands on the earlier article by presenting a comparison of the Colorcurve and SCA-2541 (Swiss Colour Atlas) colour order systems, again using the OSA-UCS system as a reference model. To enable direct comparison with the earlier article, the same varied but systematic sets of OSA-UCS cleavage planes were used in this new comparison. To enable comparison between these systems, and the Munsell, NCS, DIN, and Coloroid systems, the findings are graphically presented in a format similar to that used in the earlier article.