Stampin' Up! colors are keyed to the Pantone system. What they found was that several colors had "drifted" away from their original Pantone numbers over a few years time and they had to work to bring them back to where they were supposed to be. Brocade Blue was the last one on the list that the manufacturer had not been able to correct back to the original shade until just recently.
I asked at one time which Pantone numbers matched our cardstock, since I have Pagemaker, which allows me to pick the color of my printing soas to match Pantone numbers, but I was told it was proprietary info
I wanted to print my journaling to match!