Yes, and the match is genuinely close enough that nobody would clock the difference on the wall.
Dulux Sloe Flower is your best bet at ΔE 0.7 from Wevet, with an LRV of 81.4. Anything under ΔE 1 is imperceptible to the eye, so this is as near as you'll get without buying the original tin. Sloe Flower carries that same soft, barely-there cool white character — the clean, faintly grey undertone that makes Wevet so popular on ceilings and as a crisp gallery white.
If you'd rather a trade-counter option, Crown Fresh Coconut sits at ΔE 0.8 (LRV 83.7). A touch lighter, but still a dead ringer, and Crown's trade emulsion is hard-wearing and easy to roll. For a modern, low-VOC choice that posts to your door, COAT Low Salt comes in at ΔE 1.3 (LRV 86.1) — slightly brighter and bouncier with light because of that higher LRV, which is no bad thing in a north-facing room that needs lifting.
The "but what about" here is sheen and depth. Farrow & Ball's Estate Emulsion has a distinctive chalky, ultra-matt finish and a certain pigment density that the cheaper alternatives won't replicate exactly, even at a perfect colour match. So if it's specifically that *F&B look* you're chasing rather than just the colour, you'll lose a little of the flat, light-absorbing quality. For most jobs — ceilings, trim-adjacent walls, a clean white scheme — you won't miss it.
Practical advice: whites shift more than you'd think with light and surrounding colours, so grab a tester of Sloe Flower and paint a decent A4 patch next to your existing Wevet (or a Wevet card) before committing. Cool whites can read cold in a north light, so check it morning and evening. If it leans too clinical, COAT Low Salt's extra brightness might suit you better.