ΔE 21.4, loose: different enough that you should pick on purpose. Knight-Questor Flesh is noticeably darker, more muted, warmer than Sekigahara.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 21). Knight-Questor Flesh is noticeably darker, more muted, warmer than Sekigahara.
The same difference applies the other way round: Sekigahara is noticeably lighter, more saturated, 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 Knight-Questor Flesh on the colour wheel
All matches: Sekigahara equivalents · Knight-Questor Flesh equivalents