WooCommerce API Product Sync plugin can sync automatically product from one WooCommerce web store (shop) to the other WooCommerce web stores (shops) when product add/update. Also, sync bulk products in multiple web stores. It is the perfect solution for separate WooCommerce web stores.
Demo: https://codecanyon.net/item/woocommerce-api-product-sync-with-multiple-web-stores-shops/21672540