ΔE 11.9, fair: the same colour family, but not a straight swap. Medium Sea Gray 2 (RAF) is a little lighter than Combat Fatigues.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 12). Medium Sea Gray 2 (RAF) is a little lighter than Combat Fatigues.
The same difference applies the other way round: Combat Fatigues is a little darker.
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 Combat Fatigues on the colour wheel See Medium Sea Gray 2 (RAF) on the colour wheel
All matches: Combat Fatigues equivalents · Medium Sea Gray 2 (RAF) equivalents