ΔE 22.6, loose: different enough that you should pick on purpose. Seraph Red is noticeably darker, warmer than Glorious Magenta.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 23). Seraph Red is noticeably darker, warmer than Glorious Magenta.
The same difference applies the other way round: Glorious Magenta is noticeably lighter, 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 Glorious Magenta on the colour wheel See Seraph Red on the colour wheel
All matches: Glorious Magenta equivalents · Seraph Red equivalents