ΔE 10.1, fair: the same colour family, but not a straight swap. Fire Red is more muted, cooler than Burnt Sienna.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 10). Fire Red is more muted, cooler than Burnt Sienna.
The same difference applies the other way round: Burnt Sienna is more saturated, warmer.
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 Burnt Sienna on the colour wheel See Fire Red on the colour wheel
All matches: Burnt Sienna equivalents · Fire Red equivalents