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