ΔE 11.5, fair: the same colour family, but not a straight swap. Gory Red is a little darker, more muted, cooler than Firethorn Brown.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 11). Gory Red is a little darker, more muted, cooler than Firethorn Brown.
The same difference applies the other way round: Firethorn Brown is a little lighter, 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 Firethorn Brown on the colour wheel See Gory Red on the colour wheel
All matches: Firethorn Brown equivalents · Gory Red equivalents