ΔE 18.5, loose: different enough that you should pick on purpose. Middle Brown is a little lighter, much more saturated than Sunburst Ochre.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 19). Middle Brown is a little lighter, much more saturated than Sunburst Ochre.
The same difference applies the other way round: Sunburst Ochre is a little darker, much more muted.
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.
See Sunburst Ochre on the colour wheel See Middle Brown on the colour wheel
All matches: Sunburst Ochre equivalents · Middle Brown equivalents