USMC Green FS 34095 vs Green Yellow

How close are they?

ΔE 13.4, fair: the same colour family, but not a straight swap. Green Yellow is a little lighter, much more muted than USMC Green FS 34095.

Can I use Green Yellow instead of USMC Green FS 34095?

Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 13). Green Yellow is a little lighter, much more muted than USMC Green FS 34095.

Can I use USMC Green FS 34095 instead of Green Yellow?

The same difference applies the other way round: USMC Green FS 34095 is a little darker, 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.