ΔE 6.7, close: similar, with a visible difference side by side. Russ. AF Grey N.8 is a little darker, cooler than Sword Grey.
Usually, if you are not matching paint already on the model. Close match (ΔE 7). Russ. AF Grey N.8 is a little darker, cooler than Sword Grey.
The same difference applies the other way round: Sword Grey is a little lighter, warmer.
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 Sword Grey on the colour wheel See Russ. AF Grey N.8 on the colour wheel
All matches: Sword Grey equivalents · Russ. AF Grey N.8 equivalents