ΔE 5.6, very close: most people won’t see a difference side by side. White Star is a little lighter than Valhallan Blizzard. They are different kinds of paint: Citadel Valhallan Blizzard is a technical paint or medium and Two Thin Coats White Star is an opaque base/layer 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 6). White Star is a little lighter than Valhallan Blizzard. They are different kinds of paint.
The same difference applies the other way round: Valhallan Blizzard 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 Valhallan Blizzard on the colour wheel See White Star on the colour wheel
All matches: Valhallan Blizzard equivalents · White Star equivalents