ΔE 4.7, very close: most people won’t see a difference side by side. OSL White is a little darker than Valhallan Blizzard. They are different kinds of paint: Citadel Valhallan Blizzard is a technical paint or medium and Green Stuff World OSL 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 5). OSL White is a little darker than Valhallan Blizzard. They are different kinds of paint.
The same difference applies the other way round: Valhallan Blizzard is a little lighter.
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 OSL White on the colour wheel
All matches: Valhallan Blizzard equivalents · OSL White equivalents