Sulfide Ochre vs Dragon Fang

How close are they?

ΔE 15.2, loose: different enough that you should pick on purpose. Dragon Fang is noticeably lighter, more muted, warmer than Sulfide Ochre.

Can I use Dragon Fang instead of Sulfide Ochre?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 15). Dragon Fang is noticeably lighter, more muted, warmer than Sulfide Ochre.

Can I use Sulfide Ochre instead of Dragon Fang?

The same difference applies the other way round: Sulfide Ochre is noticeably darker, more saturated, 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.