ΔE 9.0, close: similar, with a visible difference side by side. Fire Drake is a little lighter than Deep Brown. They are different kinds of paint: AK Interactive Deep Brown is an opaque base/layer paint and Army Painter Fire Drake is a one-coat contrast-style 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 9). Fire Drake is a little lighter than Deep Brown. They are different kinds of paint.
The same difference applies the other way round: Deep Brown is a little darker.
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 Deep Brown on the colour wheel See Fire Drake on the colour wheel
All matches: Deep Brown equivalents · Fire Drake equivalents