ΔE 7.0, close: similar, with a visible difference side by side. Flat Aluminum is a little darker than Stormhost Silver.
Usually, if you are not matching paint already on the model. Close match (ΔE 7). Flat Aluminum is a little darker than Stormhost Silver.
The same difference applies the other way round: Stormhost Silver is a little lighter.
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 Stormhost Silver on the colour wheel See Flat Aluminum on the colour wheel
All matches: Stormhost Silver equivalents · Flat Aluminum equivalents