ΔE 8.4, close: similar, with a visible difference side by side. Trooper White is a little lighter, more saturated than Apothecary White. They are different kinds of paint: Citadel Apothecary White is a one-coat contrast-style paint and Two Thin Coats Trooper White is an opaque base/layer 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 8). Trooper White is a little lighter, more saturated than Apothecary White. They are different kinds of paint.
The same difference applies the other way round: Apothecary White is a little darker, 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 Apothecary White on the colour wheel See Trooper White on the colour wheel
All matches: Apothecary White equivalents · Trooper White equivalents