ΔE 10.1, fair: the same colour family, but not a straight swap. Troll Shadow is noticeably darker than Mid Battle Dress.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 10). Troll Shadow is noticeably darker than Mid Battle Dress.
The same difference applies the other way round: Mid Battle Dress is noticeably lighter.
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 Mid Battle Dress on the colour wheel See Troll Shadow on the colour wheel
All matches: Mid Battle Dress equivalents · Troll Shadow equivalents