Export from Craft 3.4 to Craft 3.0 using Feedback
I would highly advise against trying to import anything directly into tables. I don't know when it was added, but everything now has a global identifier (UID) which you cannot add manually. FeedMe sounded like the right approach; I'd look at running that import on the production site and letting FeedMe import the content for you through the control panel rather than trying to directly add it to the database.