ΔE 9.4, close: similar, with a visible difference side by side. Ivory White is a little lighter, warmer than Silver Grey.
Usually, if you are not matching paint already on the model. Close match (ΔE 9). Ivory White is a little lighter, warmer than Silver Grey.
The same difference applies the other way round: Silver Grey is a little darker, 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 Silver Grey on the colour wheel See Ivory White on the colour wheel
All matches: Silver Grey equivalents · Ivory White equivalents