Easiest swap you'll ever make, this one. Dulux Mouse Tail (LRV 21.3) matches Dulux Heritage Waxed Khaki at ΔE 0 — that's not "close", that's the same colour. They're both Dulux, just sitting in different ranges. The Heritage line carries a price premium and a slightly more refined finish, but the pigment recipe lands in the same place. If you're just after the colour on a wall, Mouse Tail gets you there for less.
The honest question is whether you're paying for the colour or the paint. Dulux Heritage has a flatter, chalkier matt and a bit more depth of finish than standard Dulux — some folk genuinely notice it on a big feature wall in raking light. If that's you, the Heritage premium isn't wasted. But for a hallway, a utility, or anywhere you're not nose-to-the-wall scrutinising the sheen, Mouse Tail is the sensible call and nobody will ever know.
Want to step outside Dulux entirely? Two near-matches worth a look:
- Crown Fern Canopy (LRV 18.6, ΔE 3.5) — a touch deeper and greener, sits in Crown's well-priced trade-friendly range.
- COAT Retrograde (LRV 18.6, ΔE 3.7) — same slightly darker territory, with COAT's low-VOC formulation and proper test pots if you want to compare before committing.
Both are a hair off the original — ΔE 3.5 and 3.7 means you'd spot the difference if you held swatches side by side, but on a finished wall they read as the same family. They're alternatives, not clones.
Practical advice: order a tester of Mouse Tail and brush it out next to your Waxed Khaki sample. Paint two coats, let it dry properly, and view it morning and evening. At ΔE 0 you'll be reaching for the cheaper tin with a clear conscience — that's a verified match, not marketing.