This is a way you can get the swatches in Zbrush (not real swatches but a way to use color IDs)
On the attached .zip file there is a polypainted Ztool (plane) with all the color references.
Just pick the desired color from it ( C key by default) and paint your own subtool with this color where you want Quixel DDO to assign the corresponding material.
For more flexibility you will find on the zip : a ZProject, a Ztool and the texture.
You can save it into your ZProjects - ZTools - ZStartup/Textures folder for it is still there when you launch ZBrush.
May this help
Quixel-swatches-ZBrush.zip
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