ΔE 6.8, close: similar, with a visible difference side by side. Transparent White is a little darker, more muted than Wrack White. They are different kinds of paint: Citadel Wrack White is an opaque base/layer paint and Pro Acryl Transparent White is an ink, glaze or transparent 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 7). Transparent White is a little darker, more muted than Wrack White. They are different kinds of paint.
The same difference applies the other way round: Wrack White is a little lighter, more saturated.
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 Transparent White on the colour wheel
All matches: Wrack White equivalents · Transparent White equivalents