What are the similarities between ecosystems in forests and parks?

Despite the fact that the forest is a natural ecosystem, and the park is artificial, they contain producers, consumers and decomposers. Trees are the main producers both in the park and in the forest. Both ecosystems produce oxygen. In the park, too, in most cases, there is tiering, but it is less pronounced, its structure is less complex than in the forest. Consumables in the park are: birds (titmouses, sparrows, crows, woodpeckers, jays), insects (beetles, butterflies, ladybugs, flies, wasps, grasshoppers, snails, slugs), small mammals (mice, squirrels, hedgehogs) , the size and species diversity of consumers is much larger. Reducers of both the park and the forest are: bacteria, fungi (they are present mainly in old parks), earthworms.