ΔE 6.0, close: similar, with a visible difference side by side. Insignia White is a little darker, more muted than Gray FS36622.
Usually, if you are not matching paint already on the model. Close match (ΔE 6). Insignia White is a little darker, more muted than Gray FS36622.
The same difference applies the other way round: Gray FS36622 is a little lighter, more saturated.
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 Gray FS36622 on the colour wheel See Insignia White on the colour wheel
All matches: Gray FS36622 equivalents · Insignia White equivalents