Hunter Dunn is one of those deep, foresty greens that reads almost black in low light and comes alive as a proper green in daylight — beautiful on panelling, joinery and snug rooms. If you want to stay in that territory but move to Dulux, here's the honest picture.
The nearest match is Dulux Woodland Fern 1 (LRV 7) at ΔE 3.4 from the original. The second contender is Dulux Highland Green (LRV 6.7) at ΔE 3.8. Neither lands under the ΔE 2.5 threshold I'd call "very close" — so be straight with yourself: these are good neighbours, not identical twins. At ΔE 3.4 the difference is noticeable side by side, but in a finished room most people would never clock it.
Of the two, Woodland Fern 1 edges it on accuracy and tends to hold that slightly cooler, more contemplative cast Hunter Dunn has. Highland Green can pull a touch warmer and more pine-y depending on your light — which some people actually prefer for a cosy space.
The "but what about the finish" question: Paint & Paper Library's Architects' Matt and Architects' Eggshell have a particular flat, chalky depth that flatters dark greens. Dulux's Heritage line or their eggshell will get you in the ballroom but the surface quality reads slightly different on a deep colour, where sheen and pigment depth matter most. If the budget allows and you love the original, it's worth asking whether the saving justifies the swap on a feature wall — dark greens are exactly where the premium brands earn their keep.
Practical bit: order both Dulux sample pots, paint two A4 boards with two coats, and stand them against your skirting in morning and evening light. Deep greens shift dramatically through the day, so a board you can move around the room beats a patch on the wall every time. Whichever you choose, prime properly and don't skimp on coats — these saturated colours need full coverage to sit true.