Dark Ghost Grey FS 36320 vs Grey Seer

How close are they?

ΔE 9.8, close: similar, with a visible difference side by side. Grey Seer is a little lighter than Dark Ghost Grey FS 36320.

Can I use Grey Seer instead of Dark Ghost Grey FS 36320?

Usually, if you are not matching paint already on the model. Close match (ΔE 10). Grey Seer is a little lighter than Dark Ghost Grey FS 36320.

Can I use Dark Ghost Grey FS 36320 instead of Grey Seer?

The same difference applies the other way round: Dark Ghost Grey FS 36320 is a little darker.

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.