Wyvern Fury vs Mayhem Red

How close are they?

ΔE 9.6, close: similar, with a visible difference side by side. Mayhem Red is more saturated, warmer than Wyvern Fury.

Can I use Mayhem Red instead of Wyvern Fury?

Usually, if you are not matching paint already on the model. Close match (ΔE 10). Mayhem Red is more saturated, warmer than Wyvern Fury.

Can I use Wyvern Fury instead of Mayhem Red?

The same difference applies the other way round: Wyvern Fury is more muted, 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.