ΔE 12.3, fair: the same colour family, but not a straight swap. Ink Magenta is cooler than Vampire Red. They are different kinds of paint: Army Painter Vampire Red is an opaque base/layer paint and Vallejo Ink Magenta 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 12). Ink Magenta is cooler than Vampire Red. They are different kinds of paint.
The same difference applies the other way round: Vampire Red is 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 Vampire Red on the colour wheel See Ink Magenta on the colour wheel
All matches: Vampire Red equivalents · Ink Magenta equivalents