Stormhost Silver vs Interference Blue (Fine)

How close are they?

ΔE 23.8, loose: different enough that you should pick on purpose. Interference Blue (Fine) is noticeably lighter, more saturated than Stormhost Silver. They are different kinds of paint: Citadel Stormhost Silver is a metallic and Golden Interference Blue (Fine) is a pearl paint, so they won’t behave the same on the model even where the colour is close.

Can I use Interference Blue (Fine) instead of Stormhost Silver?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 24). Interference Blue (Fine) is noticeably lighter, more saturated than Stormhost Silver. They are different kinds of paint.

Can I use Stormhost Silver instead of Interference Blue (Fine)?

The same difference applies the other way round: Stormhost Silver is noticeably 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.