Space Wolves Grey vs Grey Mist

How close are they?

ΔE 24.1, loose: different enough that you should pick on purpose. Grey Mist is noticeably darker, much more muted than Space Wolves Grey.

Can I use Grey Mist instead of Space Wolves Grey?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 24). Grey Mist is noticeably darker, much more muted than Space Wolves Grey.

Can I use Space Wolves Grey instead of Grey Mist?

The same difference applies the other way round: Space Wolves Grey is noticeably lighter, much 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.