ΔE 13.6, fair: the same colour family, but not a straight swap. Snake Fang is a little lighter, much more saturated than Ancient Stone.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 14). Snake Fang is a little lighter, much more saturated than Ancient Stone.
The same difference applies the other way round: Ancient Stone is a little 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.
See Ancient Stone on the colour wheel See Snake Fang on the colour wheel
All matches: Ancient Stone equivalents · Snake Fang equivalents