ΔE 15.3, loose: different enough that you should pick on purpose. Our swatches for the two are almost the same. They are different kinds of paint: Army Painter Fire Drake is a one-coat contrast-style paint and Golden Raw Sienna is an ink, glaze or transparent paint, so they won’t behave the same on the model even where the colour is close.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 15). The swatches are almost the same. They are different kinds of paint.
The same difference applies the other way round.
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 Raw Sienna on the colour wheel
All matches: Fire Drake equivalents · Raw Sienna equivalents