ΔE 8.3, close: similar, with a visible difference side by side. Bramble Grove is a little lighter, warmer than RAF PRU Blue BS381C/636.
Usually, if you are not matching paint already on the model. Close match (ΔE 8). Bramble Grove is a little lighter, warmer than RAF PRU Blue BS381C/636.
The same difference applies the other way round: RAF PRU Blue BS381C/636 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.
See RAF PRU Blue BS381C/636 on the colour wheel See Bramble Grove on the colour wheel
All matches: RAF PRU Blue BS381C/636 equivalents · Bramble Grove equivalents