ΔE 15.5, loose: different enough that you should pick on purpose. Scarlet is a little darker, more muted, cooler than Scarlett Red.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 15). Scarlet is a little darker, more muted, cooler than Scarlett Red.
The same difference applies the other way round: Scarlett Red is a little lighter, 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 Scarlett Red on the colour wheel See Scarlet on the colour wheel
All matches: Scarlett Red equivalents · Scarlet equivalents