Stormhost Silver vs Silver Blade

How close are they?

ΔE 8.5, close: similar, with a visible difference side by side. Silver Blade is a little darker than Stormhost Silver.

Can I use Silver Blade instead of Stormhost Silver?

Usually, if you are not matching paint already on the model. Close match (ΔE 9). Silver Blade is a little darker than Stormhost Silver.

Can I use Stormhost Silver instead of Silver Blade?

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.