Averland Sunset vs Sol Yellow

How close are they?

ΔE 20.9, loose: different enough that you should pick on purpose. Sol Yellow is a little lighter, more saturated, cooler than Averland Sunset.

Can I use Sol Yellow instead of Averland Sunset?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 21). Sol Yellow is a little lighter, more saturated, cooler than Averland Sunset.

Can I use Averland Sunset instead of Sol Yellow?

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