Comparison

Mopboard Black vs Greenblack

Benjamin Moore CW-680 and Sherwin-Williams SW 6994, ΔE 1.32 apart

Benjamin Moore Mopboard Black CW-680 on a wall, hex #373839
Mopboard Black Benjamin Moore CW-680
Sherwin-Williams Greenblack SW 6994 on a wall, hex #373A3A
Greenblack Sherwin-Williams SW 6994
Zeytin’s verdict · ΔE 1.32Twins, almost. Only daylight on a big wall tells them apart.

Benjamin Moore Mopboard Black (CW-680) and Sherwin-Williams Greenblack (SW 6994) measure a delta-E of 1.32 apart. Mopboard Black is 2.1 LRV points lighter, which is the difference you notice first. Both carry a similar amount of color, at chroma 0.8 and 1.3. The difference is measurable but subtle. It shows on a large wall in strong daylight and disappears under lamplight. If you need the Greenblack depth in Benjamin Moore's line, start from its LRV of 4.1 rather than matching by name.

Is Benjamin Moore Mopboard Black the same color as Sherwin-Williams Greenblack?

Not quite, but close - Benjamin Moore Mopboard Black and Sherwin-Williams Greenblack are delta-E 1.32 apart, close enough that most rooms would not show the difference.

What is the delta-E between Benjamin Moore Mopboard Black and Sherwin-Williams Greenblack?

The measured color distance between Benjamin Moore Mopboard Black and Sherwin-Williams Greenblack is delta-E 1.32.

Which is lighter, Benjamin Moore Mopboard Black or Sherwin-Williams Greenblack?

Benjamin Moore Mopboard Black is lighter than Sherwin-Williams Greenblack by 2.1 points of light reflectance (LRV).

CLOSEST PAIRΔE 1.32 Mopboard Black and Greenblack
LIGHTESTMopboard Black LRV 6.2
DARKESTGreenblack LRV 4.1
SPREAD2.1LRV points

Side by side

measured values
Mopboard Black Greenblack
Brand Benjamin Moore Sherwin-Williams
Code CW-680 SW 6994
Hex #373839 #373A3A
Light reflectance 6.2 4.1
Undertone true neutral true neutral
Chroma 0.8 1.3
Hue angle 256.3° 199.5°
Color family black black

Each on its own

full detail