Very fuzzy question.
Historically, people used aids to write music, throwing dice for intervals, and so on. Is using AI any different?
Here's the big question.
In a court of law, how can anyone prove whether the lyrics came from the computer in your skull, or the computer in your laptop? And how can that be demonstrated to a jury of our peers?
So yeah, there's a big difference. AI does the composition work for you. No other method does.
The big question: If you have edited the lyrics to get rid of the predictable and goofy rhymes, and the cliches that are often out of place..... And you are claiming that YOU actually wrote it..... there's no current method that I'm aware of that can prove AI wrote it or that you wrote it. All you would have to do is point to any of Lennon McCartney's songs..... Strawberry Fields, I am the Walrus, Yellow Submarine and you have a slam dunk. Of course this doesn't consider any watermarking or saving of the lyrics in the AI servers, that AI is creating and if it is subpoenable into a court. This can be a deep hole if one was interested in exploring all of the "what-ifs" in this topic.