ΔE 14.4, fair: the same colour family, but not a straight swap. Mortarion Green Clear is a little darker, much more muted than Green Fluor. They are different kinds of paint: AK Interactive Green Fluor is a fluorescent or effect paint and Citadel Mortarion Green Clear is an opaque base/layer 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). Mortarion Green Clear is a little darker, much more muted than Green Fluor. They are different kinds of paint.
The same difference applies the other way round: Green Fluor is a little lighter, much more saturated.
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 Green Fluor on the colour wheel See Mortarion Green Clear on the colour wheel
All matches: Green Fluor equivalents · Mortarion Green Clear equivalents