Skorne Red vs Fire Flame

How close are they?

ΔE 27.2, loose: different enough that you should pick on purpose. Fire Flame is noticeably lighter, much more saturated than Skorne Red.

Can I use Fire Flame instead of Skorne Red?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 27). Fire Flame is noticeably lighter, much more saturated than Skorne Red.

Can I use Skorne Red instead of Fire Flame?

The same difference applies the other way round: Skorne Red is noticeably darker, much more muted.

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.