Color name
It’s very hard to tell in a night screenshot. The light one might actually be black; I was amazed by my friend in her all Abyss plate while standing in Melandru’s temple and how golden it looked thanks to lighting.
The darker color in your shot has some red and brown tones. It could be one of the Midnights. You should go to one of the many dye sites and look through the palette for the closest match you can find, then preview it in game (y’know, I have tested all sorts of TP preview on armor and weapons but have thus far neglected to try previewing dyes. If those work you can check right off the TP for the hue you’re seeking).