ΔE 25.6, loose: different enough that you should pick on purpose. Scarlet Red is a little darker, warmer than Carmine Dragon.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 26). Scarlet Red is a little darker, warmer than Carmine Dragon.
The same difference applies the other way round: Carmine Dragon is a little lighter, cooler.
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 Carmine Dragon on the colour wheel See Scarlet Red on the colour wheel
All matches: Carmine Dragon equivalents · Scarlet Red equivalents