ΔE 15.4, loose: different enough that you should pick on purpose. Elven Gold is noticeably lighter, more saturated than Runelord Brass.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 15). Elven Gold is noticeably lighter, more saturated than Runelord Brass.
The same difference applies the other way round: Runelord Brass 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 Runelord Brass on the colour wheel See Elven Gold on the colour wheel
All matches: Runelord Brass equivalents · Elven Gold equivalents