ΔE 15.0, fair: the same colour family, but not a straight swap. Brethil Blush is a little darker, much more muted than Sunny Skin Tone.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 15). Brethil Blush is a little darker, much more muted than Sunny Skin Tone.
The same difference applies the other way round: Sunny Skin Tone is a little lighter, much 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 Sunny Skin Tone on the colour wheel See Brethil Blush on the colour wheel
All matches: Sunny Skin Tone equivalents · Brethil Blush equivalents