Fanatic Orange vs Orange Rust

How close are they?

ΔE 13.7, fair: the same colour family, but not a straight swap. Orange Rust is a little darker, more muted, warmer than Fanatic Orange.

Can I use Orange Rust instead of Fanatic Orange?

Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 14). Orange Rust is a little darker, more muted, warmer than Fanatic Orange.

Can I use Fanatic Orange instead of Orange Rust?

The same difference applies the other way round: Fanatic Orange is a little lighter, more saturated, 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.