ΔE 10.5, fair: the same colour family, but not a straight swap. Steel Legion Drab is more muted, warmer than IJA #7 Ohryuko Nana Go Shoku (Olive Brown).
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 11). Steel Legion Drab is more muted, warmer than IJA #7 Ohryuko Nana Go Shoku (Olive Brown).
The same difference applies the other way round: IJA #7 Ohryuko Nana Go Shoku (Olive Brown) is more saturated, 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 IJA #7 Ohryuko Nana Go Shoku (Olive Brown) on the colour wheel See Steel Legion Drab on the colour wheel
All matches: IJA #7 Ohryuko Nana Go Shoku (Olive Brown) equivalents · Steel Legion Drab equivalents