ΔE 18.3, loose: different enough that you should pick on purpose. Permanent Green Light is a little darker, much more saturated, warmer than Hexwraith Flame. They are different kinds of paint: Citadel Hexwraith Flame is a one-coat contrast-style paint and Golden Permanent Green Light is an ink, glaze or transparent paint, so they won’t behave the same on the model even where the colour is close.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 18). Permanent Green Light is a little darker, much more saturated, warmer than Hexwraith Flame. They are different kinds of paint.
The same difference applies the other way round: Hexwraith Flame is a little lighter, much 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 Hexwraith Flame on the colour wheel See Permanent Green Light on the colour wheel
All matches: Hexwraith Flame equivalents · Permanent Green Light equivalents