Gunner Camo vs Troll Green

How close are they?

ΔE 20.6, loose: different enough that you should pick on purpose. Troll Green is much more saturated, warmer than Gunner Camo.

Can I use Troll Green instead of Gunner Camo?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 21). Troll Green is much more saturated, warmer than Gunner Camo.

Can I use Gunner Camo instead of Troll Green?

The same difference applies the other way round: Gunner Camo is much more muted, cooler.

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.