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