ΔE 16.8, loose: different enough that you should pick on purpose. Snake Fang is a little lighter, much more muted, cooler than Barren Dune.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 17). Snake Fang is a little lighter, much more muted, cooler than Barren Dune.
The same difference applies the other way round: Barren Dune is a little darker, much more saturated, 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 Barren Dune on the colour wheel See Snake Fang on the colour wheel
All matches: Barren Dune equivalents · Snake Fang equivalents