Gutrippa Flesh vs Warm Yellow

How close are they?

ΔE 46.9, loose: different enough that you should pick on purpose. Warm Yellow is noticeably lighter, much more saturated, warmer than Gutrippa Flesh.

Can I use Warm Yellow instead of Gutrippa Flesh?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 47). Warm Yellow is noticeably lighter, much more saturated, warmer than Gutrippa Flesh.

Can I use Gutrippa Flesh instead of Warm Yellow?

The same difference applies the other way round: Gutrippa Flesh is noticeably darker, much 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.