Chantilly Lace vs Simply White
Chantilly Lace (LRV 92) is the coolest, brightest white Benjamin Moore makes with almost no undertone; Simply White (LRV 89) runs a touch warmer and yellower, three points darker but still one of BM's brighter whites.
Chantilly Lace Benjamin Moore · OC-65 LRV 92
Pick Chantilly Lace for a dim, north-facing room that needs maximum brightness with zero warm cast.
Simply White Benjamin Moore · OC-117 LRV 89
Pick Simply White when the room can handle a touch of warmth and you want a bright white that is not quite as stark as Chantilly Lace.
How close are they?
Delta-E (perceptual color distance) between Chantilly Lace and Simply White is 3.7 (a visible but subtle difference, more apparent side by side than in separate rooms). LRV runs 92 for Chantilly Lace versus 89 for Simply White, a 3-point gap.