ΔE 14.3, fair: the same colour family, but not a straight swap. Squig Orange is more saturated, warmer than Sekigahara.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 14). Squig Orange is more saturated, warmer than Sekigahara.
The same difference applies the other way round: Sekigahara 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 Sekigahara on the colour wheel See Squig Orange on the colour wheel
All matches: Sekigahara equivalents · Squig Orange equivalents