ΔE 11.3, fair: the same colour family, but not a straight swap. Red Truth is a little lighter, more saturated than Fiery Vermilion.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 11). Red Truth is a little lighter, more saturated than Fiery Vermilion.
The same difference applies the other way round: Fiery Vermilion 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 Fiery Vermilion on the colour wheel See Red Truth on the colour wheel
All matches: Fiery Vermilion equivalents · Red Truth equivalents