ΔE 12.7, fair: the same colour family, but not a straight swap. Pink Nacre is a little darker, more saturated than Mithril.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 13). Pink Nacre is a little darker, more saturated than Mithril.
The same difference applies the other way round: Mithril is a little lighter, 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 Mithril on the colour wheel See Pink Nacre on the colour wheel
All matches: Mithril equivalents · Pink Nacre equivalents