ΔE 24.4, loose: different enough that you should pick on purpose. Elven Green is noticeably lighter, more saturated, warmer than Warboss Green.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 24). Elven Green is noticeably lighter, more saturated, warmer than Warboss Green.
The same difference applies the other way round: Warboss Green is noticeably 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 Warboss Green on the colour wheel See Elven Green on the colour wheel
All matches: Warboss Green equivalents · Elven Green equivalents