Silver Grey vs Insignia White

How close are they?

ΔE 8.9, close: similar, with a visible difference side by side. Insignia White is a little lighter, more muted, cooler than Silver Grey.

Can I use Insignia White instead of Silver Grey?

Usually, if you are not matching paint already on the model. Close match (ΔE 9). Insignia White is a little lighter, more muted, cooler than Silver Grey.

Can I use Silver Grey instead of Insignia White?

The same difference applies the other way round: Silver Grey is a little darker, more saturated, warmer.

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.