ΔE 9.6, close: similar, with a visible difference side by side. Matt Varnish is a little darker than Titanium White.
Usually, if you are not matching paint already on the model. Close match (ΔE 10). Matt Varnish is a little darker than Titanium White.
The same difference applies the other way round: Titanium White 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.
See Titanium White on the colour wheel See Matt Varnish on the colour wheel
All matches: Titanium White equivalents · Matt Varnish equivalents