Generally it is possible via export/export. Export goods from Magento 2 installation.
Before importing them to Magrento 1.9 store you need to perform a few things:
- Re-create in Magento 1.9 the and attribute sets with attributes as you had in Magento 2.
- Make sure that Magento 1.9 you have the same category structure as in Magento 2.
- Copy images from Magento 2 installation to media/import folder of your Magento 1.9.
- Since Magento 1 and Magento 2 databases have different structure, you might need to adjust the file to requirements of Magento 1 and then import it.
Some might advise to transfer data via backup/restore. But I would say that is definitely not recommended since these versions have different database structure.
Here is also an article with tips how to transfer data from one Magento to another -
https://www.mag-manager.com/useful-articles/how-to/how-to-transfer-magento-data-from-one-store-to-an...