Sanderson Snowy Owl is a lovely soft off-white, but you don't need to pay Sanderson money to get it. Three matches stand out, and all of them are close enough that nobody walking into the room will ever know the difference.
The pick of the bunch is COAT::Low Salt at ΔE 1.4. Anything under 2.5 is very close and under 1 is imperceptible to the eye, so 1.4 puts you firmly in "can't tell them apart" territory. COAT is a cracking modern brand — low-VOC, water-based, and their matt covers beautifully. With an LRV of 86.1 it stays bright and airy without tipping into stark, which is exactly the character Snowy Owl trades on.
Next up is Crown::Fresh Coconut at ΔE 1.7, LRV 83.7. Crown is genuinely good value and widely stocked, so if you want something off the shelf at a trade counter tomorrow, this is your one. Slightly lower LRV than Low Salt, so a touch softer and cosier — handy if your room gets a lot of harsh light.
And Dulux::Snow Scene at ΔE 2, LRV 90.3 — the brightest of the three and the easiest to lay hands on anywhere. Still well within "very close," just leaning a fraction lighter.
The usual "but what about" here: a tight ΔE on paper doesn't guarantee an identical *feel* once it's on four walls, because finish, sheen and your room's light all play their part. A matt Snowy Owl and a matt Low Salt will read closer than a matt versus an eggshell. So match the sheen level too, not just the colour.
Practical advice: buy a sample pot of whichever you fancy — Low Salt if I'm choosing — paint two coats on a bit of lining paper, and move it round the room over a day before you commit. Done that, you're sorted.