ΔE 35.1, loose: different enough that you should pick on purpose. Fire Flame is a little lighter, much more saturated, warmer than Sanguine Highlight.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 35). Fire Flame is a little lighter, much more saturated, warmer than Sanguine Highlight.
The same difference applies the other way round: Sanguine Highlight is a little darker, much 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 Sanguine Highlight on the colour wheel See Fire Flame on the colour wheel
All matches: Sanguine Highlight equivalents · Fire Flame equivalents