Light Grey FS 36495 vs Brigade Grey

How close are they?

ΔE 6.5, close: similar, with a visible difference side by side. Brigade Grey is a little lighter than Light Grey FS 36495.

Can I use Brigade Grey instead of Light Grey FS 36495?

Usually, if you are not matching paint already on the model. Close match (ΔE 6). Brigade Grey is a little lighter than Light Grey FS 36495.

Can I use Light Grey FS 36495 instead of Brigade Grey?

The same difference applies the other way round: Light Grey FS 36495 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.