ΔE 10.3, fair: the same colour family, but not a straight swap. Naphthol Pink is a little lighter, more muted than Carmine Dragon. They are different kinds of paint: Army Painter Carmine Dragon is a one-coat contrast-style paint and Golden Naphthol Pink is an ink, glaze or transparent paint, so they won’t behave the same on the model even where the colour is close.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 10). Naphthol Pink is a little lighter, more muted than Carmine Dragon. They are different kinds of paint.
The same difference applies the other way round: Carmine Dragon is a little darker, 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 Carmine Dragon on the colour wheel See Naphthol Pink on the colour wheel
All matches: Carmine Dragon equivalents · Naphthol Pink equivalents