Seraphim Sepia vs Blush Red

How close are they?

ΔE 43.1, loose: different enough that you should pick on purpose. Blush Red is much more saturated, cooler than Seraphim Sepia.

Can I use Blush Red instead of Seraphim Sepia?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 43). Blush Red is much more saturated, cooler than Seraphim Sepia.

Can I use Seraphim Sepia instead of Blush Red?

The same difference applies the other way round: Seraphim Sepia is much more muted, 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.