Comparison

Soft Peach Mist vs Grey Castle

Dunn-Edwards DE5126 and Dutch Boy VS-9132, ΔE 2.11 apart

Dunn-Edwards Soft Peach Mist DE5126 on a wall, hex #FFF3F0
Soft Peach Mist Dunn-Edwards DE5126
Dutch Boy Grey Castle VS-9132 on a wall, hex #FCEFE9
Grey Castle Dutch Boy VS-9132
Zeytin’s verdict · ΔE 2.11Close cousins. Paint a sample of each before you choose.

Dunn-Edwards Soft Peach Mist (DE5126) and Dutch Boy Grey Castle (VS-9132) measure a delta-E of 2.11 apart. Soft Peach Mist is 3.4 LRV points lighter, which is the difference you notice first. Both carry a similar amount of color, at chroma 4.5 and 5.6. Close, but a large sample of each will show the gap, particularly against white trim. If you need the Grey Castle depth in Dunn-Edwards's line, start from its LRV of 88.3 rather than matching by name.

Is Dunn-Edwards Soft Peach Mist the same color as Dutch Boy Grey Castle?

Not quite, but close - Dunn-Edwards Soft Peach Mist and Dutch Boy Grey Castle are delta-E 2.11 apart, close enough that most rooms would not show the difference.

What is the delta-E between Dunn-Edwards Soft Peach Mist and Dutch Boy Grey Castle?

The measured color distance between Dunn-Edwards Soft Peach Mist and Dutch Boy Grey Castle is delta-E 2.11.

Which is lighter, Dunn-Edwards Soft Peach Mist or Dutch Boy Grey Castle?

Dunn-Edwards Soft Peach Mist is lighter than Dutch Boy Grey Castle by 3.4 points of light reflectance (LRV).

CLOSEST PAIRΔE 2.11 Soft Peach Mist and Grey Castle
LIGHTESTSoft Peach Mist LRV 91.7
DARKESTGrey Castle LRV 88.3
SPREAD3.4LRV points

Side by side

measured values
Soft Peach Mist Grey Castle
Brand Dunn-Edwards Dutch Boy
Code DE5126 VS-9132
Hex #FFF3F0 #FCEFE9
Light reflectance 91.7 88.3
Undertone greige greige
Chroma 4.5 5.6
Hue angle 39.2° 52.9°
Color family white white

Each on its own

full detail