Light Grey FS 36495 vs Mutant Hue

How close are they?

ΔE 18.7, loose: different enough that you should pick on purpose. Mutant Hue is a little lighter, much more saturated than Light Grey FS 36495.

Can I use Mutant Hue instead of Light Grey FS 36495?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 19). Mutant Hue is a little lighter, much more saturated than Light Grey FS 36495.

Can I use Light Grey FS 36495 instead of Mutant Hue?

The same difference applies the other way round: Light Grey FS 36495 is a little darker, much 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.