Intermediate Blue (US Navy) vs Light Blue Green

How close are they?

ΔE 15.3, loose: different enough that you should pick on purpose. Light Blue Green is a little lighter, warmer than Intermediate Blue (US Navy).

Can I use Light Blue Green instead of Intermediate Blue (US Navy)?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 15). Light Blue Green is a little lighter, warmer than Intermediate Blue (US Navy).

Can I use Intermediate Blue (US Navy) instead of Light Blue Green?

The same difference applies the other way round: Intermediate Blue (US Navy) 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.