From My Little Wiki
Cascade's Waterfall refers to the second version of the Waterfall playset to be sold in the UK. Like the first UK edition it has a green base (as opposed the US edition's white base) but it comes with a new pony, Cascade instead of the previous pony Sprinkles.
This Waterfall was available as part of the Year Four (1985-1986) collection.
Brazil's Estrela version of the Waterfall Playset features Duck Soup with a completely different mould. Below is a collage or Brazilian Duck Soup with regular Duck Soup for comparison.
Brazilian Duck Soup (Estrela)