ΔE 29.9, loose: different enough that you should pick on purpose. Terre Verte Hue is much more muted, cooler than Nurgle's Rot. They are different kinds of paint: Citadel Nurgle's Rot is a technical paint or medium and Golden Terre Verte Hue is an opaque base/layer paint, so they won’t behave the same on the model even where the colour is close.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 30). Terre Verte Hue is much more muted, cooler than Nurgle's Rot. They are different kinds of paint.
The same difference applies the other way round: Nurgle's Rot 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.
See Nurgle's Rot on the colour wheel See Terre Verte Hue on the colour wheel
All matches: Nurgle's Rot equivalents · Terre Verte Hue equivalents