If you want White Dove in a Dulux tin, go for Clinic White. It lands at ΔE 0.6 from the original, which is well under the threshold of 1 where the human eye stops noticing any difference. For all practical purposes, that's the same colour — paint a wall in each and you'd struggle to tell them apart even side by side.
The runner-up is Magic White at ΔE 0.9. Still very close — anything under 2.5 is considered a strong match — but Clinic White is the one to specify if you can.
Why might you want this swap? Usually it's cost and availability. Benjamin Moore is a cracking brand but it's pricier and stocked in fewer places over here, so matching to Dulux makes sense if you're doing a big job or topping up on a budget.
A word on what makes White Dove tick: it's a soft, warm off-white with a gentle grey-green undertone that stops it ever reading stark or clinical. The reason Clinic White matches so well is that it carries the same warmth — Clinic White sits at LRV 86.8 and Magic White at 85.1, both genuinely light whites that bounce plenty of daylight back into a room. White Dove itself sits comfortably in that bright-but-soft territory.
The "but what about" here: undertones shift with light. White Dove's warm grey lean can drift slightly cool in a north-facing room and warm up nicely in afternoon sun — and the Dulux matches will do exactly the same, because that's the nature of the colour, not the brand. So test in situ.
Practical advice: grab a sample of Clinic White, paint two coats on a bit of lining paper, and tape it up on the wall you're doing. Look at it morning and evening before you commit. And whichever you pick, if you're going over a strong or patchy base, prime first with a coat of Zinsser Cover Stain so the white sits clean and true rather than grinning through.