ΔE 8.8, close: similar, with a visible difference side by side. Gray FS36622 is a little lighter, more saturated than Wrack White.
Usually, if you are not matching paint already on the model. Close match (ΔE 9). Gray FS36622 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 Gray FS36622 on the colour wheel
All matches: Wrack White equivalents · Gray FS36622 equivalents