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