ΔE 13.4, fair: the same colour family, but not a straight swap. Averland Sunset is much more saturated than Mustard.
Can I use Averland Sunset instead of Mustard?
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 13). Averland Sunset is much more saturated than Mustard.
Can I use Mustard instead of Averland Sunset?
The same difference applies the other way round: Mustard is much more muted.
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.