Voidshield Blue vs Interior Blue Soviet

How close are they?

ΔE 6.1, close: similar, with a visible difference side by side. Interior Blue Soviet is a little darker than Voidshield Blue.

Can I use Interior Blue Soviet instead of Voidshield Blue?

Usually, if you are not matching paint already on the model. Close match (ΔE 6). Interior Blue Soviet is a little darker than Voidshield Blue.

Can I use Voidshield Blue instead of Interior Blue Soviet?

The same difference applies the other way round: Voidshield Blue 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.