Rust vs Wazdakka Red

How close are they?

ΔE 16.7, loose: different enough that you should pick on purpose. Wazdakka Red is a little lighter, much more saturated, cooler than Rust.

Can I use Wazdakka Red instead of Rust?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 17). Wazdakka Red is a little lighter, much more saturated, cooler than Rust.

Can I use Rust instead of Wazdakka Red?

The same difference applies the other way round: Rust is a little darker, 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.