Vineroot Shade vs Nuln Oil

How close are they?

ΔE 26.1, loose: different enough that you should pick on purpose. Nuln Oil is a little darker, much more muted than Vineroot Shade.

Can I use Nuln Oil instead of Vineroot Shade?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 26). Nuln Oil is a little darker, much more muted than Vineroot Shade.

Can I use Vineroot Shade instead of Nuln Oil?

The same difference applies the other way round: Vineroot Shade is a little lighter, much more saturated.

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.