Gutrippa Flesh vs Yellow Submarine

How close are they?

ΔE 33.1, loose: different enough that you should pick on purpose. Yellow Submarine is a little lighter, more saturated, warmer than Gutrippa Flesh.

Can I use Yellow Submarine instead of Gutrippa Flesh?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 33). Yellow Submarine is a little lighter, more saturated, warmer than Gutrippa Flesh.

Can I use Gutrippa Flesh instead of Yellow Submarine?

The same difference applies the other way round: Gutrippa Flesh is a little darker, more muted, cooler.

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.