Black Rose Immortal vs Gorthor Brown

How close are they?

ΔE 7.8, close: similar, with a visible difference side by side. Gorthor Brown is warmer than Black Rose Immortal.

Can I use Gorthor Brown instead of Black Rose Immortal?

Usually, if you are not matching paint already on the model. Close match (ΔE 8). Gorthor Brown is warmer than Black Rose Immortal.

Can I use Black Rose Immortal instead of Gorthor Brown?

The same difference applies the other way round: Black Rose Immortal is cooler.

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.