ΔE 10.0, fair: the same colour family, but not a straight swap. Fire Flame is a little lighter, more saturated than Demon Red.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 10). Fire Flame is a little lighter, more saturated than Demon Red.
The same difference applies the other way round: Demon Red is a little darker, more muted.
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 Demon Red on the colour wheel See Fire Flame on the colour wheel
All matches: Demon Red equivalents · Fire Flame equivalents