ΔE 3.8, very close: most people won’t see a difference side by side. Ink White is a little lighter than White Scar. They are different kinds of paint: Citadel White Scar is an opaque base/layer paint and Vallejo Ink White is an ink, glaze or transparent paint, so they won’t behave the same on the model even where the colour is close.
Yes, for most jobs. Very close match (ΔE 4). Ink White is a little lighter than White Scar. They are different kinds of paint.
The same difference applies the other way round: White Scar is a little darker.
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 White Scar on the colour wheel See Ink White on the colour wheel
All matches: White Scar equivalents · Ink White equivalents