ΔE 12.5, fair: the same colour family, but not a straight swap. Rus. AF Grey Prot. Coat is more saturated than Gypsum White.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 13). Rus. AF Grey Prot. Coat is more saturated than Gypsum White.
The same difference applies the other way round: Gypsum White is 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 Gypsum White on the colour wheel See Rus. AF Grey Prot. Coat on the colour wheel
All matches: Gypsum White equivalents · Rus. AF Grey Prot. Coat equivalents