ΔE 18.8, loose: different enough that you should pick on purpose. Sekigahara is noticeably lighter, much more muted than Dragon Red.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 19). Sekigahara is noticeably lighter, much more muted than Dragon Red.
The same difference applies the other way round: Dragon Red is noticeably darker, much more saturated.
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 Dragon Red on the colour wheel See Sekigahara on the colour wheel
All matches: Dragon Red equivalents · Sekigahara equivalents