ΔE 9.6, close: similar, with a visible difference side by side. Interference Blue (Fine) is more saturated than Wrack White. They are different kinds of paint: Citadel Wrack White is an opaque base/layer paint and Golden Interference Blue (Fine) is a pearl paint, so they won’t behave the same on the model even where the colour is close.
Usually, if you are not matching paint already on the model. Close match (ΔE 10). Interference Blue (Fine) is more saturated than Wrack White. They are different kinds of paint.
The same difference applies the other way round: Wrack White is more muted.
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 Wrack White on the colour wheel See Interference Blue (Fine) on the colour wheel
All matches: Wrack White equivalents · Interference Blue (Fine) equivalents