ΔE 13.6, fair: the same colour family, but not a straight swap. Middle Stone is noticeably lighter, warmer than USMC Green FS 34095.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 14). Middle Stone is noticeably lighter, warmer than USMC Green FS 34095.
The same difference applies the other way round: USMC Green FS 34095 is noticeably darker, 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.
See USMC Green FS 34095 on the colour wheel See Middle Stone on the colour wheel
All matches: USMC Green FS 34095 equivalents · Middle Stone equivalents