ΔE 6.4, close: similar, with a visible difference side by side. Terminatus Stone is a little darker than Silver Grey.
Usually, if you are not matching paint already on the model. Close match (ΔE 6). Terminatus Stone is a little darker than Silver Grey.
The same difference applies the other way round: Silver Grey is a little lighter.
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 Silver Grey on the colour wheel See Terminatus Stone on the colour wheel
All matches: Silver Grey equivalents · Terminatus Stone equivalents