ΔE 11.6, fair: the same colour family, but not a straight swap. Samurai Green is a little lighter, more saturated, warmer than Hydra Turquoise.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 12). Samurai Green is a little lighter, more saturated, warmer than Hydra Turquoise.
The same difference applies the other way round: Hydra Turquoise is a little darker, more muted, cooler.
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 Hydra Turquoise on the colour wheel See Samurai Green on the colour wheel
All matches: Hydra Turquoise equivalents · Samurai Green equivalents