ΔE 11.1, fair: the same colour family, but not a straight swap. Ancient Sepia is a little lighter, cooler than Seraphim Sepia.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 11). Ancient Sepia is a little lighter, cooler than Seraphim Sepia.
The same difference applies the other way round: Seraphim Sepia is a little 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 Seraphim Sepia on the colour wheel See Ancient Sepia on the colour wheel
All matches: Seraphim Sepia equivalents · Ancient Sepia equivalents