ΔE 6.5, close: similar, with a visible difference side by side. Walnut Brown is a little lighter, warmer than Typhus Corrosion. They are different kinds of paint: Citadel Typhus Corrosion is a technical paint or medium and Green Stuff World Walnut Brown is an ink, glaze or transparent paint, so they won’t behave the same on the model even where the colour is close.
Usually, if you are not matching paint already on the model. Close match (ΔE 6). Walnut Brown is a little lighter, warmer than Typhus Corrosion. They are different kinds of paint.
The same difference applies the other way round: Typhus Corrosion is a little 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 Typhus Corrosion on the colour wheel See Walnut Brown on the colour wheel
All matches: Typhus Corrosion equivalents · Walnut Brown equivalents