ΔE 12.8, fair: the same colour family, but not a straight swap. Sekigahara is noticeably darker, more muted, cooler than Violent Vermillion.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 13). Sekigahara is noticeably darker, more muted, cooler than Violent Vermillion.
The same difference applies the other way round: Violent Vermillion is noticeably lighter, more saturated, warmer.
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 Violent Vermillion on the colour wheel See Sekigahara on the colour wheel
All matches: Violent Vermillion equivalents · Sekigahara equivalents