ΔE 12.7, fair: the same colour family, but not a straight swap. Burnt Sienna is a little darker, more saturated than Gore-Grunta Fur. They are different kinds of paint: Citadel Gore-Grunta Fur is a one-coat contrast-style paint and Golden Burnt Sienna 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 13). Burnt Sienna is a little darker, more saturated than Gore-Grunta Fur. They are different kinds of paint.
The same difference applies the other way round: Gore-Grunta Fur 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 Gore-Grunta Fur on the colour wheel See Burnt Sienna on the colour wheel
All matches: Gore-Grunta Fur equivalents · Burnt Sienna equivalents