ΔE 7.1, close: similar, with a visible difference side by side. Liquid Mask is a little lighter, more muted than Moon Mist Grey.
Usually, if you are not matching paint already on the model. Close match (ΔE 7). Liquid Mask is a little lighter, more muted than Moon Mist Grey.
The same difference applies the other way round: Moon Mist Grey is a little darker, more saturated.
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 Moon Mist Grey on the colour wheel See Liquid Mask on the colour wheel
All matches: Moon Mist Grey equivalents · Liquid Mask equivalents