Sunburst Ochre vs Noble Steed Brown

How close are they?

ΔE 16.2, loose: different enough that you should pick on purpose. Noble Steed Brown is a little lighter, much more muted than Sunburst Ochre.

Can I use Noble Steed Brown instead of Sunburst Ochre?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 16). Noble Steed Brown is a little lighter, much more muted than Sunburst Ochre.

Can I use Sunburst Ochre instead of Noble Steed Brown?

The same difference applies the other way round: Sunburst Ochre is a little darker, much more saturated.

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.