If you want Dulux Heritage Potters Pink but in the standard Dulux line-up — usually because it's easier to get mixed and a bit cheaper — go for Dulux Satin Bow. It measures ΔE 0.7 from the original, and anything under 1 is imperceptible to the human eye. Put the two side by side on a wall and you genuinely won't be able to tell them apart. Satin Bow sits at LRV 64.1, so it's a light, soft pink that bounces plenty of light around without going stark.
Your second option is Dulux Nomadic Glow 4 at ΔE 1.4 (LRV 62.6). Still very close — under 2.5 is what the trade considers a confident match — but it's a touch deeper and reads marginally warmer. If Satin Bow comes out feeling a hair too cool or chalky on your particular wall, Nomadic Glow 4 is the one to reach for instead.
The "but what about" here: people assume the Heritage range is somehow a different *quality* of paint, so they're reluctant to swap. It isn't, in terms of colour — Heritage is mostly about a curated, period-friendly palette and a particular sheen offering. The pigment in Potters Pink is matched almost exactly by Satin Bow, so you lose nothing on the colour itself. What you might want to keep an eye on is finish: Heritage has its own emulsion and eggshell sheens, so match the sheen level to the job, not just the colour name.
Practical advice — order a Satin Bow tester and brush out two coats on lining paper, then move it round the room over a day. Pinks shift hard depending on light: north-facing rooms pull them grey and cool, while warm afternoon light brings the rosiness out. Get it right under your own lighting before you commit a full tin, and you'll be sorted.