ΔE 8.8, close: similar, with a visible difference side by side. Decal Fix is a little darker, more muted than Blue FS35622.
Usually, if you are not matching paint already on the model. Close match (ΔE 9). Decal Fix is a little darker, more muted than Blue FS35622.
The same difference applies the other way round: Blue FS35622 is a little lighter, more saturated.
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 Blue FS35622 on the colour wheel See Decal Fix on the colour wheel
All matches: Blue FS35622 equivalents · Decal Fix equivalents