ΔE 15.3, loose: different enough that you should pick on purpose. Russ. AF Grey N.8 is a little darker, more saturated than Gypsum White.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 15). Russ. AF Grey N.8 is a little darker, more saturated than Gypsum White.
The same difference applies the other way round: Gypsum 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 Gypsum White on the colour wheel See Russ. AF Grey N.8 on the colour wheel
All matches: Gypsum White equivalents · Russ. AF Grey N.8 equivalents