ΔE 11.9, fair: the same colour family, but not a straight swap. Castellan Green is a little darker, cooler than RAL 6007 Grün.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 12). Castellan Green is a little darker, cooler than RAL 6007 Grün.
The same difference applies the other way round: RAL 6007 Grün is a little lighter, 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 RAL 6007 Grün on the colour wheel See Castellan Green on the colour wheel
All matches: RAL 6007 Grün equivalents · Castellan Green equivalents