ΔE 11.5, fair: the same colour family, but not a straight swap. Scarlet is a little lighter, more saturated than Mayhem Red.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 12). Scarlet is a little lighter, more saturated than Mayhem Red.
The same difference applies the other way round: Mayhem 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 Mayhem Red on the colour wheel See Scarlet on the colour wheel
All matches: Mayhem Red equivalents · Scarlet equivalents