ΔE 10.9, fair: the same colour family, but not a straight swap. Matt Sepia is a little lighter, more saturated, warmer than Matt Grime.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 11). Matt Sepia is a little lighter, more saturated, warmer than Matt Grime.
The same difference applies the other way round: Matt Grime is a little darker, more muted, 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 Matt Grime on the colour wheel See Matt Sepia on the colour wheel
All matches: Matt Grime equivalents · Matt Sepia equivalents