Canoptek Alloy vs Red Goblin

How close are they?

ΔE 24.6, loose: different enough that you should pick on purpose. Red Goblin is a little darker, much more saturated, cooler than Canoptek Alloy.

Can I use Red Goblin instead of Canoptek Alloy?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 25). Red Goblin is a little darker, much more saturated, cooler than Canoptek Alloy.

Can I use Canoptek Alloy instead of Red Goblin?

The same difference applies the other way round: Canoptek Alloy is a little lighter, much more muted, warmer.

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.