ΔE 13.8, fair: the same colour family, but not a straight swap. Orange Neon is a little darker, more saturated than Magmadroth Flame. They are different kinds of paint: Citadel Magmadroth Flame is a one-coat contrast-style paint and Scale75 Orange Neon is a fluorescent or effect 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 14). Orange Neon is a little darker, more saturated than Magmadroth Flame. They are different kinds of paint.
The same difference applies the other way round: Magmadroth Flame is a little lighter, 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 Magmadroth Flame on the colour wheel See Orange Neon on the colour wheel
All matches: Magmadroth Flame equivalents · Orange Neon equivalents