Thicket Grove vs Death Guard Green

How close are they?

ΔE 16.4, loose: different enough that you should pick on purpose. Death Guard Green is more saturated, cooler than Thicket Grove.

Can I use Death Guard Green instead of Thicket Grove?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 16). Death Guard Green is more saturated, cooler than Thicket Grove.

Can I use Thicket Grove instead of Death Guard Green?

The same difference applies the other way round: Thicket Grove is more muted, 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.