Ajax pagination and Load more works with widgets
Olegnax Infinite Scroll and Ajax Pagination extension works with any widget that have pagination, and not limited to product widgets. Below a couple examples of Magento default product widgets. You can have multiple ajax paginations on the same page.
Catalog Product List Widget
Items 1 to 5 of 30 total
Catalog Product List Widget Second Example
Items 6 to 10 of 20 total