Maybe this is timely. We’re having all our bathrooms gutted and redone. Just today our contractor asked what colors we wanted them painted, so I asked which company’s color samples we did get. He said if I’m going to a place like home Depot, Behr or Dunn Edwards.
I don’t think it matters which color samples you get. Everyone has to be able to reproduce everyone else’s colors. The only differences might be that if you use a different company’s color samples, then it takes them a little bit more work to do the color match, rather than simply giving them their company’s name for a color; and you may get a guarantee on the color if you use their own colors.