ΔE 18.5, loose: different enough that you should pick on purpose. Drain Life is noticeably lighter, more muted than Fire Drake.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 19). Drain Life is noticeably lighter, more muted than Fire Drake.
The same difference applies the other way round: Fire Drake is noticeably darker, 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 Fire Drake on the colour wheel See Drain Life on the colour wheel
All matches: Fire Drake equivalents · Drain Life equivalents