ΔE 6.9, close: similar, with a visible difference side by side. Pastel Blue is a little lighter, more saturated than Intermediate Blue FS35164.
Usually, if you are not matching paint already on the model. Close match (ΔE 7). Pastel Blue is a little lighter, more saturated than Intermediate Blue FS35164.
The same difference applies the other way round: Intermediate Blue FS35164 is a little darker, 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 Intermediate Blue FS35164 on the colour wheel See Pastel Blue on the colour wheel
All matches: Intermediate Blue FS35164 equivalents · Pastel Blue equivalents