Here they are in the bottle under the Ott light.
On the hand in sun. RBL is on the ring finger - third from the left.
Close up in the sun with Nfu-Oh on the left and RBL on the right.
Close up under the Ott light with Nfu-Oh on the top and RBL on the bottom.
You can see that the Nfu-Oh is a bit lighter and yellow based. The RBL is darker with more grey and slightly cooler in color. In the house I can't see much of a difference and in the sun there is a bigger difference. They aren't dupes but if you like those dusty/murky colors Nfu-Oh 563 is a good choice.