Unfortunately, the color index that VNC uses when in 8-bit mode is not well balanced. Those were the only two colors that were grey. Any others wandered very far off into being colored. That being said, I intend to implement a way to get it to show your colored faceplates (definitely blue, red, green, and amber in addition to white -- and maybe some others, just for fun, too) sometime in the near future. Those might come close to the original values, except for blue.