Yes, and it's a cracking match. Dulux Velvet Truffle 5 sits at ΔE 0.5 from Mylands Threadneedle No.262 (LRV 64.9) — that's well under 1, which means the difference is imperceptible to the eye on a wall. Stand the two side by side and you'd struggle to tell them apart. For a soft, warm off-neutral like Threadneedle, that's about as good as a substitution gets.
If you'd rather a different brand, Crown White Pepper (LRV 62.9) comes in at ΔE 2.1, which is still a very close match — under 2.5, so any shift only shows in the most punishing light. COAT Sweater Season (LRV 62.7) lands at ΔE 2.9, just outside the "very close" band; it'll read a touch different but lives in the same family and is a perfectly respectable swap if you're already buying COAT for other rooms.
Now, the honest bit. What you give up going from Mylands to a trade brand isn't the colour — it's the finish. Mylands pigment load is dense, and their Marble Matt has a particular flat, chalky depth that flagship trade emulsions don't quite replicate. On a feature wall in good light you might notice Threadneedle has a slightly richer presence. On ceilings, halls and bedrooms, nobody will ever know.
My advice: if this is a hero wall in a south-facing room where the finish matters, spend on the Mylands. If it's a whole-house repaint and you're counting tins, go Velvet Truffle 5 and put the saving towards better rollers and a second coat done properly. Order a sample pot of both, paint a decent A2 patch of each, and live with them for a couple of days through morning and evening light before you commit. Colour on a screen lies — colour on your own wall doesn't.