ΔE 14.6, fair: the same colour family, but not a straight swap. Mantis Warriors Green is much more muted than Shamrock Green.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 15). Mantis Warriors Green is much more muted than Shamrock Green.
The same difference applies the other way round: Shamrock Green is much more saturated.
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 Shamrock Green on the colour wheel See Mantis Warriors Green on the colour wheel
All matches: Shamrock Green equivalents · Mantis Warriors Green equivalents