Sap Green Hue vs Uniform Green

How close are they?

ΔE 15.6, loose: different enough that you should pick on purpose. Uniform Green is much more muted, cooler than Sap Green Hue.

Can I use Uniform Green instead of Sap Green Hue?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 16). Uniform Green is much more muted, cooler than Sap Green Hue.

Can I use Sap Green Hue instead of Uniform Green?

The same difference applies the other way round: Sap Green Hue is much more saturated, warmer.

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.