ΔE 22.2, loose: different enough that you should pick on purpose. Ocean Light is noticeably lighter than Temple Guard Blue.
Can I use Ocean Light instead of Temple Guard Blue?
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 22). Ocean Light is noticeably lighter than Temple Guard Blue.
Can I use Temple Guard Blue instead of Ocean Light?
The same difference applies the other way round: Temple Guard Blue is noticeably darker.
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.