ΔE 15.2, loose: different enough that you should pick on purpose. Scarlett Red is a little darker, more muted, cooler than Mythical Orange.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 15). Scarlett Red is a little darker, more muted, cooler than Mythical Orange.
The same difference applies the other way round: Mythical Orange 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 Mythical Orange on the colour wheel See Scarlett Red on the colour wheel
All matches: Mythical Orange equivalents · Scarlett Red equivalents