Flesh Rose vs Orange Brown

How close are they?

ΔE 17.2, loose: different enough that you should pick on purpose. Orange Brown is a little darker, more muted, warmer than Flesh Rose.

Can I use Orange Brown instead of Flesh Rose?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 17). Orange Brown is a little darker, more muted, warmer than Flesh Rose.

Can I use Flesh Rose instead of Orange Brown?

The same difference applies the other way round: Flesh Rose is a little lighter, 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.