ΔE 10.6, fair: the same colour family, but not a straight swap. Transparent Brown is more muted, warmer than Doombull Brown. They are different kinds of paint: Citadel Doombull Brown is an opaque base/layer paint and Green Stuff World Transparent Brown is an ink, glaze or transparent paint, so they won’t behave the same on the model even where the colour is close.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 11). Transparent Brown is more muted, warmer than Doombull Brown. They are different kinds of paint.
The same difference applies the other way round: Doombull Brown is more saturated, 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 Doombull Brown on the colour wheel See Transparent Brown on the colour wheel
All matches: Doombull Brown equivalents · Transparent Brown equivalents