Command Red vs Firethorn Brown

How close are they?

ΔE 12.3, fair: the same colour family, but not a straight swap. Firethorn Brown is more muted, warmer than Command Red.

Can I use Firethorn Brown instead of Command Red?

Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 12). Firethorn Brown is more muted, warmer than Command Red.

Can I use Command Red instead of Firethorn Brown?

The same difference applies the other way round: Command Red is more saturated, 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.