ΔE 9.9, close: similar, with a visible difference side by side. Glacier Blue is a little darker, more saturated than Zinc White.
Usually, if you are not matching paint already on the model. Close match (ΔE 10). Glacier Blue is a little darker, more saturated than Zinc White.
The same difference applies the other way round: Zinc White is a little lighter, 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 Zinc White on the colour wheel See Glacier Blue on the colour wheel
All matches: Zinc White equivalents · Glacier Blue equivalents