ΔE 20.5, loose: different enough that you should pick on purpose. Beetle Green is a little darker, much more saturated than Titanium Silver.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 21). Beetle Green is a little darker, much more saturated than Titanium Silver.
The same difference applies the other way round: Titanium Silver is a little lighter, much more muted.
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 Titanium Silver on the colour wheel See Beetle Green on the colour wheel
All matches: Titanium Silver equivalents · Beetle Green equivalents