Squig Orange vs Orange Peel

How close are they?

ΔE 9.1, close: similar, with a visible difference side by side. Orange Peel is a little lighter, more saturated than Squig Orange.

Can I use Orange Peel instead of Squig Orange?

Usually, if you are not matching paint already on the model. Close match (ΔE 9). Orange Peel is a little lighter, more saturated than Squig Orange.

Can I use Squig Orange instead of Orange Peel?

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