Regiment Grey vs Cold Armour

How close are they?

ΔE 7.1, close: similar, with a visible difference side by side. Cold Armour is more saturated than Regiment Grey.

Can I use Cold Armour instead of Regiment Grey?

Usually, if you are not matching paint already on the model. Close match (ΔE 7). Cold Armour is more saturated than Regiment Grey.

Can I use Regiment Grey instead of Cold Armour?

The same difference applies the other way round: Regiment Grey is more muted.

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.