ΔE 16.3, loose: different enough that you should pick on purpose. Sunset Orange is a little lighter, much more saturated than Mars Orange.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 16). Sunset Orange is a little lighter, much more saturated than Mars Orange.
The same difference applies the other way round: Mars Orange 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 Mars Orange on the colour wheel See Sunset Orange on the colour wheel
All matches: Mars Orange equivalents · Sunset Orange equivalents