Comparison

Vast Sky vs Sailboat

Sherwin-Williams SW 6506 and Valspar 4005-5B, ΔE 2.08 apart

Sherwin-Williams Vast Sky SW 6506 on a wall, hex #A9C9D7
Vast Sky Sherwin-Williams SW 6506
Valspar Sailboat 4005-5B on a wall, hex #AAC5D4
Sailboat Valspar 4005-5B
Zeytin’s verdict · ΔE 2.08Close cousins. Paint a sample of each before you choose.

Sherwin-Williams Vast Sky (SW 6506) and Valspar Sailboat (4005-5B) measure a delta-E of 2.08 apart. Vast Sky is 1.9 LRV points lighter, which is the difference you notice first. Both carry a similar amount of color, at chroma 13 and 12.1. Close, but a large sample of each will show the gap, particularly against white trim. If you need the Sailboat depth in Sherwin-Williams's line, start from its LRV of 53.0 rather than matching by name.

Is Sherwin-Williams Vast Sky the same color as Valspar Sailboat?

Not quite, but close - Sherwin-Williams Vast Sky and Valspar Sailboat are delta-E 2.08 apart, close enough that most rooms would not show the difference.

What is the delta-E between Sherwin-Williams Vast Sky and Valspar Sailboat?

The measured color distance between Sherwin-Williams Vast Sky and Valspar Sailboat is delta-E 2.08.

Which is lighter, Sherwin-Williams Vast Sky or Valspar Sailboat?

Sherwin-Williams Vast Sky is lighter than Valspar Sailboat by 1.9 points of light reflectance (LRV).

CLOSEST PAIRΔE 2.08 Vast Sky and Sailboat
LIGHTESTVast Sky LRV 54.9
DARKESTSailboat LRV 53.0
SPREAD1.9LRV points

Side by side

measured values
Vast Sky Sailboat
Brand Sherwin-Williams Valspar
Code SW 6506 4005-5B
Hex #A9C9D7 #AAC5D4
Light reflectance 54.9 53.0
Undertone blue undertone blue undertone
Chroma 13.0 12.1
Hue angle 234.0° 240.9°
Color family teal teal

Each on its own

full detail