Hi,
What I would recommend is to delete the tables hikashop_order, hikashop_history, hikashop_order_product, hikashop_address and hikashop_user in your staging website database. Then, export the data and structure of these tables from your old website's database.
Then, import it in your new website database.
Then, I think you'll want to click on the "check database" button of the HikaShop configuration to synchronize the new users imported from your old website to the user entries in HikaShop (as they might have a different id). Ideally, the user import/export tool you use would keep the same ids for your users in Joomla and in that case, this would not be necessary.