ΔE 36.8, loose: different enough that you should pick on purpose. Sepia Wash is noticeably lighter, warmer than Nightroot Shade.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 37). Sepia Wash is noticeably lighter, warmer than Nightroot Shade.
The same difference applies the other way round: Nightroot Shade is noticeably darker, cooler.
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 Sepia Wash on the colour wheel
All matches: Nightroot Shade equivalents · Sepia Wash equivalents