ΔE 9.3, close: similar, with a visible difference side by side. Scarlet is a little darker, more muted than Pale Carmine Red.
Usually, if you are not matching paint already on the model. Close match (ΔE 9). Scarlet is a little darker, more muted than Pale Carmine Red.
The same difference applies the other way round: Pale Carmine Red is a little lighter, more saturated.
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 Pale Carmine Red on the colour wheel See Scarlet on the colour wheel
All matches: Pale Carmine Red equivalents · Scarlet equivalents