ΔE 10.7, fair: the same colour family, but not a straight swap. Burnt Sienna is a little lighter, warmer than Berserker Bloodshade. They are different kinds of paint: Citadel Berserker Bloodshade is a wash/shade and Golden Burnt Sienna is an opaque base/layer 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). Burnt Sienna is a little lighter, warmer than Berserker Bloodshade. They are different kinds of paint.
The same difference applies the other way round: Berserker Bloodshade 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 Berserker Bloodshade on the colour wheel See Burnt Sienna on the colour wheel
All matches: Berserker Bloodshade equivalents · Burnt Sienna equivalents