ΔE 10.3, fair: the same colour family, but not a straight swap. Dark Red is more saturated, cooler than Brown Base FS-30108.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 10). Dark Red is more saturated, cooler than Brown Base FS-30108.
The same difference applies the other way round: Brown Base FS-30108 is more muted, 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 Brown Base FS-30108 on the colour wheel See Dark Red on the colour wheel
All matches: Brown Base FS-30108 equivalents · Dark Red equivalents