ΔE 26.1, loose: different enough that you should pick on purpose. Scarlet is noticeably darker, much more saturated than Red Flesh.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 26). Scarlet is noticeably darker, much more saturated than Red Flesh.
The same difference applies the other way round: Red Flesh is noticeably lighter, much 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 Red Flesh on the colour wheel See Scarlet on the colour wheel
All matches: Red Flesh equivalents · Scarlet equivalents