Lead V is one of Paint & Paper Library's lovely architectural greys — that mid-toned, slightly cool grey with real depth. The good news is you don't have to pay the premium to get it.
Dulux Steel Symphony 5 is your best bet. At ΔE 1.8 from the original it's a very close match — that's well inside the threshold where the human eye stops noticing a difference in normal light. LRV 62 keeps it on the lighter, airier side of mid-grey, so it'll bounce a decent amount of light around a room. For the money, this is the one I'd reach for.
If you want it a touch deeper and a bit more grounded, Crown Needles & Pins comes in at ΔE 2.5 with an LRV of 54.6. Still a very close match, just sitting a little lower on the light scale, which can read as more enveloping in a north-facing space.
COAT On Mute is the outlier at ΔE 3.9 — close-ish, but you'll see a difference side by side. It's lighter (LRV 66.8) and a fraction off in tone. I'd only go COAT here if you specifically want their lower-VOC formulation and can live with the shift, rather than as a true dupe.
The "but what about" worth flagging: ΔE is measured on the colour itself, not the finish. Paint & Paper Library has a particular sheen and flatness to it, especially in their Architect's Matt. The Dulux and Crown matches will get you the colour bang on, but the surface character can read slightly different. For most rooms that's a non-issue.
Practical advice: buy a tester of Steel Symphony 5, paint two coats on a bit of lining paper, and move it round the room over a day before you commit. Greys this close to neutral are sensitive to the light they sit in, so judge it on your own walls, not in the tin.