ΔE 12.8, fair: the same colour family, but not a straight swap. Naphthol Red Light is noticeably lighter, more saturated than Wyvern Fury. They are different kinds of paint: Army Painter Wyvern Fury is an opaque base/layer paint and Golden Naphthol Red Light is an ink, glaze or transparent paint, so they won’t behave the same on the model even where the colour is close.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 13). Naphthol Red Light is noticeably lighter, more saturated than Wyvern Fury. They are different kinds of paint.
The same difference applies the other way round: Wyvern Fury 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 Wyvern Fury on the colour wheel See Naphthol Red Light on the colour wheel
All matches: Wyvern Fury equivalents · Naphthol Red Light equivalents