ΔE 8.5, close: similar, with a visible difference side by side. Hydromiel Yellow is more saturated than Afterglow. They are different kinds of paint: Army Painter Afterglow is an opaque base/layer paint and Green Stuff World Hydromiel Yellow is an ink, glaze or transparent paint, so they won’t behave the same on the model even where the colour is close.
Usually, if you are not matching paint already on the model. Close match (ΔE 8). Hydromiel Yellow is more saturated than Afterglow. They are different kinds of paint.
The same difference applies the other way round: Afterglow is 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 Afterglow on the colour wheel See Hydromiel Yellow on the colour wheel
All matches: Afterglow equivalents · Hydromiel Yellow equivalents