ΔE 19.6, loose: different enough that you should pick on purpose. Medium Flesh is noticeably lighter, more saturated, warmer than Sekigahara.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 20). Medium Flesh is noticeably lighter, more saturated, warmer than Sekigahara.
The same difference applies the other way round: Sekigahara is noticeably darker, 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 Medium Flesh on the colour wheel
All matches: Sekigahara equivalents · Medium Flesh equivalents