Twilight Sky vs Thousand Sons Blue

How close are they?

ΔE 6.4, close: similar, with a visible difference side by side. Thousand Sons Blue is a little lighter than Twilight Sky.

✓ Army Painter Fanatic conversion chart lists these two as equivalents.

Can I use Thousand Sons Blue instead of Twilight Sky?

Usually, if you are not matching paint already on the model. Close match (ΔE 6). Thousand Sons Blue is a little lighter than Twilight Sky.

Can I use Twilight Sky instead of Thousand Sons Blue?

The same difference applies the other way round: Twilight Sky is a little darker.

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.