Comparison

O'Reilly Green vs Althorp Park

Benjamin Moore 555 and Vista Paint 7657, ΔE 2.6 apart

Benjamin Moore O'Reilly Green 555 on a wall, hex #CEEBB9
O'Reilly Green Benjamin Moore 555
Vista Paint Althorp Park 7657 on a wall, hex #C8E9BB
Althorp Park Vista Paint 7657
Zeytin’s verdict · ΔE 2.6Close cousins. Paint a sample of each before you choose.

Benjamin Moore O'Reilly Green (555) and Vista Paint Althorp Park (7657) measure a delta-E of 2.6 apart. O'Reilly Green is 3.1 LRV points lighter, which is the difference you notice first. Both carry a similar amount of color, at chroma 28 and 26.8. Close, but a large sample of each will show the gap, particularly against white trim. If you need the Althorp Park depth in Benjamin Moore's line, start from its LRV of 71.0 rather than matching by name.

Is Benjamin Moore O'Reilly Green the same color as Vista Paint Althorp Park?

Not quite, but close - Benjamin Moore O'Reilly Green and Vista Paint Althorp Park are delta-E 2.6 apart, close enough that most rooms would not show the difference.

What is the delta-E between Benjamin Moore O'Reilly Green and Vista Paint Althorp Park?

The measured color distance between Benjamin Moore O'Reilly Green and Vista Paint Althorp Park is delta-E 2.6.

Which is lighter, Benjamin Moore O'Reilly Green or Vista Paint Althorp Park?

Benjamin Moore O'Reilly Green is lighter than Vista Paint Althorp Park by 3.1 points of light reflectance (LRV).

CLOSEST PAIRΔE 2.6 O'Reilly Green and Althorp Park
LIGHTESTO'Reilly Green LRV 74.1
DARKESTAlthorp Park LRV 71.0
SPREAD3.1LRV points

Side by side

measured values
O'Reilly Green Althorp Park
Brand Benjamin Moore Vista Paint
Code 555 7657
Hex #CEEBB9 #C8E9BB
Light reflectance 74.1 71.0
Undertone yellow-green yellow-green
Chroma 28.0 26.8
Hue angle 130.9° 135.4°
Color family green green

Each on its own

full detail