ΔE 16.8, loose: different enough that you should pick on purpose. Evil Sunz Scarlet is more muted, cooler than Fiery Vermilion.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 17). Evil Sunz Scarlet is more muted, cooler than Fiery Vermilion.
The same difference applies the other way round: Fiery Vermilion is more saturated, 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 Fiery Vermilion on the colour wheel See Evil Sunz Scarlet on the colour wheel
All matches: Fiery Vermilion equivalents · Evil Sunz Scarlet equivalents