ΔE 11.2, fair: the same colour family, but not a straight swap. Chainmail is a little lighter than Tinmetal Grey.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 11). Chainmail is a little lighter than Tinmetal Grey.
The same difference applies the other way round: Tinmetal Grey is a little darker.
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 Tinmetal Grey on the colour wheel See Chainmail on the colour wheel
All matches: Tinmetal Grey equivalents · Chainmail equivalents