ΔE 12.2, fair: the same colour family, but not a straight swap. Fire Flame is a little lighter, cooler than Cadmium Red Medium Hue.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 12). Fire Flame is a little lighter, cooler than Cadmium Red Medium Hue.
The same difference applies the other way round: Cadmium Red Medium Hue is a little darker, 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 Cadmium Red Medium Hue on the colour wheel See Fire Flame on the colour wheel
All matches: Cadmium Red Medium Hue equivalents · Fire Flame equivalents