ΔE 10.2, fair: the same colour family, but not a straight swap. Brown RLM26 is more muted, warmer than Crimson Red.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 10). Brown RLM26 is more muted, warmer than Crimson Red.
The same difference applies the other way round: Crimson 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.
See Crimson Red on the colour wheel See Brown RLM26 on the colour wheel
All matches: Crimson Red equivalents · Brown RLM26 equivalents