ΔE 12.5, fair: the same colour family, but not a straight swap. Verdigris is a little darker, more saturated than Purity White.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 12). Verdigris is a little darker, more saturated than Purity White.
The same difference applies the other way round: Purity 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 Purity White on the colour wheel See Verdigris on the colour wheel
All matches: Purity White equivalents · Verdigris equivalents