ΔE 3.8, very close: most people won’t see a difference side by side. Ink White is a little lighter than Praxeti White. They are different kinds of paint: Citadel Praxeti White 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 Praxeti White. They are different kinds of paint.
The same difference applies the other way round: Praxeti White 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 Praxeti White on the colour wheel See Ink White on the colour wheel
All matches: Praxeti White equivalents · Ink White equivalents