There's not much difference between first and second generation Cavoodles.
However there is a bit of a difference between the first and second generation Cavoodle and that difference is that one breed sheds slightly while the other breed of dog usually doesn't shed at all.
The First Generation Cavoodles will usually shed slightly while the second generation Cavoodles usually do not shed at all.
Second generation Cavoodles results from the mating of two F1 dogs and the first generation Cavoodle dogs is the direct result of mating two purebred dogs of different breeds to create the Cavoodle.