ΔE 7.5, close: similar, with a visible difference side by side. New Wood is a little darker, more saturated than Walnut.
Usually, if you are not matching paint already on the model. Close match (ΔE 7). New Wood is a little darker, more saturated than Walnut.
The same difference applies the other way round: Walnut is a little lighter, more muted.
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 Walnut on the colour wheel See New Wood on the colour wheel
All matches: Walnut equivalents · New Wood equivalents