ΔE 12.8, fair: the same colour family, but not a straight swap. Dark Vermilion is a little lighter, more saturated, warmer than Magenta.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 13). Dark Vermilion is a little lighter, more saturated, warmer than Magenta.
The same difference applies the other way round: Magenta is a little darker, more muted, 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 Magenta on the colour wheel See Dark Vermilion on the colour wheel
All matches: Magenta equivalents · Dark Vermilion equivalents