Sorry, you want to manually insert tickets directly into the database? Why? I mean, go nuts if that's your dream, but you could use the API which does that for you, or email..
Most of the tables are the same, some fields are moved to different tables, because of increased use of the forms system, and changes to the search. If you don't hit everything right, you might be missing quite a lot.
To see what I mean, enable full query logging on a test site, make a ticket with the web interface and check the log to see what it did, that's the list of queries you'd need to perform.. seems like a hard way to go about it though.
Or maybe I'm misunderstanding what you're saying.