If you want Silent White out of a Dulux tin, go for Dulux Apple White. It lands at ΔE 0.7 from Little Greene's original, which is below the threshold the human eye can pick up — you'd genuinely struggle to tell them apart on a wall. LRV is 86.6, so it's a proper soft off-white that bounces light around without going stark.
The close second is Dulux Vanilla Wisp at ΔE 1.3 (LRV 88.4). Still a very close match — under 2.5 ΔE is the band where most people can't spot the difference in normal lighting — but it reads a touch brighter and cleaner. If your room is short on light, that extra LRV can actually work in your favour.
Now, the honest bit: a tight ΔE means the colours are near-identical, but the *paint* underneath isn't. Little Greene's finishes have a depth and chalkiness to the pigment that Dulux's mainstream emulsions don't quite replicate. Silent White has that slightly powdery, soft quality Little Greene does so well, and a Dulux match — even a spot-on one numerically — will sit a hair flatter. For most jobs that's neither here nor there. For a feature room where you're chasing a specific mood, it matters.
So the real question is *why* you're matching. Saving money on a big job? Apple White in Dulux Diamond Matt is a sound, hardwearing choice and you'll barely notice the difference. Trying to top up an existing Silent White wall without a full repaint? Don't — match the brand and finish you already have, or you risk a faint picture-frame edge where old meets new.
Get a tester of Apple White and paint it next to your Silent White swatch under daylight and lamplight before you commit to the full quantity. With ΔE this low it'll almost certainly pass, but two minutes with a tester pot saves you a world of grief.