ΔE 16.8, loose: different enough that you should pick on purpose. Splinter Green is a little darker, more muted, warmer than Eldritch.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 17). Splinter Green is a little darker, more muted, warmer than Eldritch.
The same difference applies the other way round: Eldritch is a little lighter, 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 Eldritch on the colour wheel See Splinter Green on the colour wheel
All matches: Eldritch equivalents · Splinter Green equivalents