Solar Yellow vs Yellow Ochre

How close are they?

ΔE 7.5, close: similar, with a visible difference side by side. Yellow Ochre is more saturated than Solar Yellow.

Can I use Yellow Ochre instead of Solar Yellow?

Usually, if you are not matching paint already on the model. Close match (ΔE 7). Yellow Ochre is more saturated than Solar Yellow.

Can I use Solar Yellow instead of Yellow Ochre?

The same difference applies the other way round: Solar Yellow is 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.