None of the six pairs below are the same paint. Farrow & Ball mixes its own pigments into a distinct binder system — Estate Emulsion has a chalky, absorbent finish that mass-market vinyl silk and matt simply don't replicate, whatever the hex code says. What we compared is published colour data: Farrow & Ball's and Dulux's own hex values for each shade, scored by how close they sit to each other rather than by eye.
That's a meaningful difference from a lot of "dupe" content online, which is often just two colours that look similar in a photo taken under one set of lighting. A close hex match still means testing a sample on your own wall before committing — sheen, texture and how a colour shifts under your specific light all vary between brands even when the underlying colour is nearly identical.