ΔE 11.5, fair: the same colour family, but not a straight swap. Burnt Sienna is noticeably darker than Fire Drake. They are different kinds of paint: Army Painter Fire Drake 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 11). Burnt Sienna is noticeably darker than Fire Drake. They are different kinds of paint.
The same difference applies the other way round: Fire Drake is noticeably lighter.
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 Fire Drake on the colour wheel See Burnt Sienna on the colour wheel
All matches: Fire Drake equivalents · Burnt Sienna equivalents