ΔE 44.3, loose: different enough that you should pick on purpose. Ancient Sepia is noticeably lighter, more muted, warmer than Kroak Green.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 44). Ancient Sepia is noticeably lighter, more muted, warmer than Kroak Green.
The same difference applies the other way round: Kroak Green 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.
See Kroak Green on the colour wheel See Ancient Sepia on the colour wheel
All matches: Kroak Green equivalents · Ancient Sepia equivalents