Shedding
Their coats shed differently: the Curly-Coated Retriever holds loose hair until it is brushed or clipped out, the Labrador Retriever moults most as the seasons change.
Grooming
The Curly-Coated Retriever needs more grooming, brushing a few times a week, where the Labrador Retriever needs a brush once a week.
Temperament
They differ most on affection (Curly-Coated Retriever: likes its own space; Labrador Retriever: a lap or leaning dog) and on independence (Curly-Coated Retriever: cooperative, with its own ideas; Labrador Retriever: keen to work with you).
Alike
They are much the same size as adults, about 33 kg (73 lb) for the Curly-Coated Retriever and 31 kg (68 lb) for the Labrador Retriever.