ΔE 17.0, loose: different enough that you should pick on purpose. Smoked Blue is a little darker, more muted, warmer than Temple Guard Blue.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 17). Smoked Blue is a little darker, more muted, warmer than Temple Guard Blue.
The same difference applies the other way round: Temple Guard Blue is a little lighter, 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 Temple Guard Blue on the colour wheel See Smoked Blue on the colour wheel
All matches: Temple Guard Blue equivalents · Smoked Blue equivalents