ΔE 11.5, fair: the same colour family, but not a straight swap. Guardian Green is a little darker, more muted, cooler than Space Green.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 12). Guardian Green is a little darker, more muted, cooler than Space Green.
The same difference applies the other way round: Space Green is a little lighter, 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 Space Green on the colour wheel See Guardian Green on the colour wheel
All matches: Space Green equivalents · Guardian Green equivalents