Orange Tone vs Sepia Wash

How close are they?

ΔE 47.3, loose: different enough that you should pick on purpose. Sepia Wash is much more muted, cooler than Orange Tone.

Can I use Sepia Wash instead of Orange Tone?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 47). Sepia Wash is much more muted, cooler than Orange Tone.

Can I use Orange Tone instead of Sepia Wash?

The same difference applies the other way round: Orange Tone is much more saturated, 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.