ΔE 10.8, fair: the same colour family, but not a straight swap. Scarlet is a little darker, cooler than Inferno Orange.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 11). Scarlet is a little darker, cooler than Inferno Orange.
The same difference applies the other way round: Inferno Orange is a little lighter, 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 Inferno Orange on the colour wheel See Scarlet on the colour wheel
All matches: Inferno Orange equivalents · Scarlet equivalents