ΔE 13.4, fair: the same colour family, but not a straight swap. Mars Orange is more saturated, warmer than Squig Orange.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 13). Mars Orange is more saturated, warmer than Squig Orange.
The same difference applies the other way round: Squig Orange is more muted, 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.
See Squig Orange on the colour wheel See Mars Orange on the colour wheel
All matches: Squig Orange equivalents · Mars Orange equivalents