ΔE 9.9, close: similar, with a visible difference side by side. Gray FS36081 is a little darker, more muted, warmer than Thunderhawk Blue.
Usually, if you are not matching paint already on the model. Close match (ΔE 10). Gray FS36081 is a little darker, more muted, warmer than Thunderhawk Blue.
The same difference applies the other way round: Thunderhawk Blue is a little lighter, more saturated, cooler.
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 Thunderhawk Blue on the colour wheel See Gray FS36081 on the colour wheel
All matches: Thunderhawk Blue equivalents · Gray FS36081 equivalents