Gal Vorbak Red vs Flat Brown

How close are they?

ΔE 20.4, loose: different enough that you should pick on purpose. Flat Brown is a little lighter, much more muted, warmer than Gal Vorbak Red.

Can I use Flat Brown instead of Gal Vorbak Red?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 20). Flat Brown is a little lighter, much more muted, warmer than Gal Vorbak Red.

Can I use Gal Vorbak Red instead of Flat Brown?

The same difference applies the other way round: Gal Vorbak Red is a little darker, much more saturated, cooler.

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.