ΔE 13.3, fair: the same colour family, but not a straight swap. Fang White is a little lighter, more saturated than Wrack White.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 13). Fang White is a little lighter, more saturated than Wrack White.
The same difference applies the other way round: Wrack 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 Wrack White on the colour wheel See Fang White on the colour wheel
All matches: Wrack White equivalents · Fang White equivalents