ΔE 16.3, loose: different enough that you should pick on purpose. Heartfire is a little lighter, cooler than Fire Dragon Bright.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 16). Heartfire is a little lighter, cooler than Fire Dragon Bright.
The same difference applies the other way round: Fire Dragon Bright is a little darker, 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 Fire Dragon Bright on the colour wheel See Heartfire on the colour wheel
All matches: Fire Dragon Bright equivalents · Heartfire equivalents