Comparison

Gray Sky vs Moonlight Blue

Benjamin Moore 2131-70 and Vista Paint 8268, ΔE 0.9 apart

Benjamin Moore Gray Sky 2131-70 on a wall, hex #DDE5E5
Gray Sky Benjamin Moore 2131-70
Vista Paint Moonlight Blue 8268 on a wall, hex #DCE3E2
Moonlight Blue Vista Paint 8268
Zeytin’s verdict · ΔE 0.9Same color. Buy the cheaper one.

Benjamin Moore Gray Sky (2131-70) and Vista Paint Moonlight Blue (8268) measure a delta-E of 0.9 apart. Gray Sky is 1.9 LRV points lighter, which is the difference you notice first. Both carry a similar amount of color, at chroma 2.8 and 2.5. Side by side on a wall these are effectively the same color. Choose on price and availability rather than appearance. If you need the Moonlight Blue depth in Benjamin Moore's line, start from its LRV of 74.0 rather than matching by name.

Is Benjamin Moore Gray Sky the same color as Vista Paint Moonlight Blue?

Yes, by measurement - Benjamin Moore Gray Sky and Vista Paint Moonlight Blue are only delta-E 0.9 apart, which is below what the human eye can reliably tell apart.

What is the delta-E between Benjamin Moore Gray Sky and Vista Paint Moonlight Blue?

The measured color distance between Benjamin Moore Gray Sky and Vista Paint Moonlight Blue is delta-E 0.9.

Which is lighter, Benjamin Moore Gray Sky or Vista Paint Moonlight Blue?

Benjamin Moore Gray Sky is lighter than Vista Paint Moonlight Blue by 1.9 points of light reflectance (LRV).

CLOSEST PAIRΔE 0.9 Gray Sky and Moonlight Blue
LIGHTESTGray Sky LRV 75.9
DARKESTMoonlight Blue LRV 74.0
SPREAD1.9LRV points

Side by side

measured values
Gray Sky Moonlight Blue
Brand Benjamin Moore Vista Paint
Code 2131-70 8268
Hex #DDE5E5 #DCE3E2
Light reflectance 75.9 74.0
Undertone cool teal-gray cool teal-gray
Chroma 2.8 2.5
Hue angle 199.5° 187.7°
Color family gray gray

Each on its own

full detail