ΔE 17.5, loose: different enough that you should pick on purpose. Titan Mars Pale is a little lighter, warmer than Terminatus Stone.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 17). Titan Mars Pale is a little lighter, warmer than Terminatus Stone.
The same difference applies the other way round: Terminatus Stone is a little 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 Terminatus Stone on the colour wheel See Titan Mars Pale on the colour wheel
All matches: Terminatus Stone equivalents · Titan Mars Pale equivalents