ΔE 11.0, fair: the same colour family, but not a straight swap. Remove Mana is noticeably darker than Tyrian Navy.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 11). Remove Mana is noticeably darker than Tyrian Navy.
The same difference applies the other way round: Tyrian Navy 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 Tyrian Navy on the colour wheel See Remove Mana on the colour wheel
All matches: Tyrian Navy equivalents · Remove Mana equivalents