Comparison

Dyer's Woad vs Piece of the Sky

Sherwin-Williams SW 9071 and Vista Paint 7304, ΔE 2.56 apart

Sherwin-Williams Dyer's Woad SW 9071 on a wall, hex #7B99B0
Dyer's Woad Sherwin-Williams SW 9071
Vista Paint Piece of the Sky 7304 on a wall, hex #7295AE
Piece of the Sky Vista Paint 7304
Zeytin’s verdict · ΔE 2.56Close cousins. Paint a sample of each before you choose.

Sherwin-Williams Dyer's Woad (SW 9071) and Vista Paint Piece of the Sky (7304) measure a delta-E of 2.56 apart. Dyer's Woad is 4.2 LRV points lighter, which is the difference you notice first. Both carry a similar amount of color, at chroma 16.2 and 18. Close, but a large sample of each will show the gap, particularly against white trim. If you need the Piece of the Sky depth in Sherwin-Williams's line, start from its LRV of 26.0 rather than matching by name.

Is Sherwin-Williams Dyer's Woad the same color as Vista Paint Piece of the Sky?

Not quite, but close - Sherwin-Williams Dyer's Woad and Vista Paint Piece of the Sky are delta-E 2.56 apart, close enough that most rooms would not show the difference.

What is the delta-E between Sherwin-Williams Dyer's Woad and Vista Paint Piece of the Sky?

The measured color distance between Sherwin-Williams Dyer's Woad and Vista Paint Piece of the Sky is delta-E 2.56.

Which is lighter, Sherwin-Williams Dyer's Woad or Vista Paint Piece of the Sky?

Sherwin-Williams Dyer's Woad is lighter than Vista Paint Piece of the Sky by 4.2 points of light reflectance (LRV).

CLOSEST PAIRΔE 2.56 Dyer's Woad and Piece of the Sky
LIGHTESTDyer's Woad LRV 30.2
DARKESTPiece of the Sky LRV 26.0
SPREAD4.2LRV points

Side by side

measured values
Dyer's Woad Piece of the Sky
Brand Sherwin-Williams Vista Paint
Code SW 9071 7304
Hex #7B99B0 #7295AE
Light reflectance 30.2 26.0
Undertone blue blue
Chroma 16.2 18.0
Hue angle 252.3° 251.0°
Color family teal teal

Each on its own

full detail