Comparison

Richmond Bisque vs Believable Buff

Benjamin Moore HC-177 and Sherwin-Williams SW 6120, ΔE 0.8 apart

Benjamin Moore Richmond Bisque HC-177 on a wall, hex #D9C6A6
Richmond Bisque Benjamin Moore HC-177
Sherwin-Williams Believable Buff SW 6120 on a wall, hex #DBC7A8
Believable Buff Sherwin-Williams SW 6120
Zeytin’s verdict · ΔE 0.8Same color. Buy the cheaper one.

Benjamin Moore Richmond Bisque (HC-177) and Sherwin-Williams Believable Buff (SW 6120) measure a delta-E of 0.8 apart. Believable Buff is 2.4 LRV points lighter, which is the difference you notice first. Both carry a similar amount of color, at chroma 18.5 and 18.2. Side by side on a wall these are effectively the same color. Choose on price and availability rather than appearance. If you need the Richmond Bisque depth in Sherwin-Williams's line, start from its LRV of 56.1 rather than matching by name.

Is Benjamin Moore Richmond Bisque the same color as Sherwin-Williams Believable Buff?

Yes, by measurement - Benjamin Moore Richmond Bisque and Sherwin-Williams Believable Buff are only delta-E 0.8 apart, which is below what the human eye can reliably tell apart.

What is the delta-E between Benjamin Moore Richmond Bisque and Sherwin-Williams Believable Buff?

The measured color distance between Benjamin Moore Richmond Bisque and Sherwin-Williams Believable Buff is delta-E 0.8.

Which is lighter, Benjamin Moore Richmond Bisque or Sherwin-Williams Believable Buff?

Sherwin-Williams Believable Buff is lighter than Benjamin Moore Richmond Bisque by 2.4 points of light reflectance (LRV).

CLOSEST PAIRΔE 0.8 Richmond Bisque and Believable Buff
LIGHTESTBelievable Buff LRV 58.5
DARKESTRichmond Bisque LRV 56.1
SPREAD2.4LRV points

Side by side

measured values
Richmond Bisque Believable Buff
Brand Benjamin Moore Sherwin-Williams
Code HC-177 SW 6120
Hex #D9C6A6 #DBC7A8
Light reflectance 56.1 58.5
Undertone yellow yellow
Chroma 18.5 18.2
Hue angle 84.8° 83.1°
Color family tan tan

Each on its own

full detail