ΔE 8.3, close: similar, with a visible difference side by side. Wooden Deck Tan is more saturated, warmer than Underhive Ash.
Usually, if you are not matching paint already on the model. Close match (ΔE 8). Wooden Deck Tan is more saturated, warmer than Underhive Ash.
The same difference applies the other way round: Underhive Ash is more muted, 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 Underhive Ash on the colour wheel See Wooden Deck Tan on the colour wheel
All matches: Underhive Ash equivalents · Wooden Deck Tan equivalents