If you want Benjamin Moore Chantilly Lace in a Dulux tin, Dulux White Cotton is your answer — it lands at ΔE 0.5 from the original, which is well below the threshold where the eye can spot a difference. Put the two side by side and you'd struggle to call which is which.
White Cotton sits at LRV 87.6, so it's a properly bright, clean white — exactly the brief Chantilly Lace was written for. That high reflectance is what makes it sing on ceilings and trim. Neither is a stark, blue-cold brilliant white, mind: Chantilly Lace carries the faintest creamy cast that cleans up to a crisp, near-pure white in cooler light, and White Cotton mirrors that same whisper of warmth.
If White Cotton isn't to hand, the runner-up is Dulux Jasmine White at ΔE 1.3 (LRV 86) — still very close, though it leans a touch warmer than Chantilly Lace, with a soft yellow undertone that reads creamy-golden in south light and pale buttery in a north-facing room. Lovely if you'd welcome a fraction more warmth in your white; if you picked Chantilly Lace precisely for its clean neutrality, stick with White Cotton.
The usual "but what about" here: don't assume a perfect ΔE means a perfect result on the wall. Sheen level changes how white reads — a matt emulsion and a gloss trim in the *same* colour will look different because of how they bounce light. So if you're matching Chantilly Lace trim, match the finish too, not just the colour. And as ever, get a tester pot and look at it in your own light across a full day before you commit a single full tin — north light and afternoon sun will tell you different stories.
For my money, White Cotton is the straight swap. Keep Jasmine White for schemes that want their white a touch cosier — it's at its best in warm light, where that buttery undertone reads gently creamy rather than chalky.