Blackroot Grey vs Black Green RLM70

How close are they?

ΔE 7.6, close: similar, with a visible difference side by side. Black Green RLM70 is a little lighter than Blackroot Grey.

Can I use Black Green RLM70 instead of Blackroot Grey?

Usually, if you are not matching paint already on the model. Close match (ΔE 8). Black Green RLM70 is a little lighter than Blackroot Grey.

Can I use Blackroot Grey instead of Black Green RLM70?

The same difference applies the other way round: Blackroot Grey 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.