Monocrome colored disc - CAROLS CD single?

[TakaSama]

I wonder if anyone has ever seen a monochrome colored copy of the disc for the CAROLS CD-ONLY single? My original CD ONLY copy looks like the disc in this picture but I found a second copy today where the disc is monochrome pink (although it is the same image of Ayu's hand). I just bought it here in Japan and it appears to be legitimate - the AVCD stamping on the inner ring of the disc is intact. Any ideas?