ΔE 8.8, close: similar, with a visible difference side by side. Insignia White is more muted, cooler than Birch.
Usually, if you are not matching paint already on the model. Close match (ΔE 9). Insignia White is more muted, cooler than Birch.
The same difference applies the other way round: Birch is 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.
See Birch on the colour wheel See Insignia White on the colour wheel
All matches: Birch equivalents · Insignia White equivalents