ΔE 12.3, fair: the same colour family, but not a straight swap. Tan Earth is noticeably lighter, cooler than Sylvaneth Bark.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 12). Tan Earth is noticeably lighter, cooler than Sylvaneth Bark.
The same difference applies the other way round: Sylvaneth Bark is noticeably darker, 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 Sylvaneth Bark on the colour wheel See Tan Earth on the colour wheel
All matches: Sylvaneth Bark equivalents · Tan Earth equivalents