ΔE 11.5, fair: the same colour family, but not a straight swap. Payne’s Grey Wash is more muted, cooler than Nightroot Shade.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 11). Payne’s Grey Wash is more muted, cooler than Nightroot Shade.
The same difference applies the other way round: Nightroot Shade is more saturated, warmer.
ΔE is the colour difference between our two swatch estimates: under about 6 is close, over about 15 is loose. Real paints also differ in finish, coverage and how they thin, so test before you commit.
See Nightroot Shade on the colour wheel See Payne’s Grey Wash on the colour wheel
All matches: Nightroot Shade equivalents · Payne’s Grey Wash equivalents