ΔE 6.8, close: similar, with a visible difference side by side. Matt White is a little lighter, more muted than Albus White.
Usually, if you are not matching paint already on the model. Close match (ΔE 7). Matt White is a little lighter, more muted than Albus White.
The same difference applies the other way round: Albus White is a little darker, more saturated.
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 Albus White on the colour wheel See Matt White on the colour wheel
All matches: Albus White equivalents · Matt White equivalents