It doesn't exist such a functionality in Sitecore Commerce.
The products (products,catalogs, categories) are persistent in Commerce Engine not in Sitecore.
Products,catalogs and categories from Sitecore are not real items, are virtual items which are shown in Content Editor using Commerce Engine Connect Catalog Provider. The provider is defined in: Sitecore.Commerce.Engine.DataProvider.config
<sitecore role:require="Standalone or ContentDelivery or ContentManagement">
<dataProviders>
<catalogProvider role:require="Standalone or ContentManagement" type="Sitecore.Commerce.Engine.Connect.DataProvider.CatalogDataProvider, Sitecore.Commerce.Engine.Connect">
<targetDatabaseName>master</targetDatabaseName>
</catalogProvider>
<catalogProvider role:require="ContentDelivery" type="Sitecore.Commerce.Engine.Connect.DataProvider.CatalogDataProvider, Sitecore.Commerce.Engine.Connect">
<targetDatabaseName>web</targetDatabaseName>
</catalogProvider>
</dataProviders>
You can serialize the items from a catalog but you can not import them into other system.