Have Glass Grey FS 36170 vs Regiment Grey

How close are they?

ΔE 9.2, close: similar, with a visible difference side by side. Regiment Grey is a little darker, more saturated than Have Glass Grey FS 36170.

Can I use Regiment Grey instead of Have Glass Grey FS 36170?

Usually, if you are not matching paint already on the model. Close match (ΔE 9). Regiment Grey is a little darker, more saturated than Have Glass Grey FS 36170.

Can I use Have Glass Grey FS 36170 instead of Regiment Grey?

The same difference applies the other way round: Have Glass Grey FS 36170 is a little lighter, 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.