ΔE 10.5, fair: the same colour family, but not a straight swap. Parasite Brown is a little lighter, more saturated than Vulcan Orange.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 11). Parasite Brown is a little lighter, more saturated than Vulcan Orange.
The same difference applies the other way round: Vulcan Orange is a little 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 Vulcan Orange on the colour wheel See Parasite Brown on the colour wheel
All matches: Vulcan Orange equivalents · Parasite Brown equivalents