I can only speak from personal experience and say a resounding "NO!"
They require different skills--at least the kind of nonfiction I write does. My nonfiction books are health-related and many are textbooks. It's hard to be breezy and free when you're writing about menopause or bladder spasms. I try, but, like I said, it's not easy.
So, I've racked my brain to come up with 5 ways to become a fiction writer if you're used to writing technical or scientific stuff.
- Start reading poetry. It is filled with wonderful descriptions of things I never even thought about. It will give you great ideas for describing people, settings, and situations.
- Read more fiction in the genre you hope to write in. While you're reading, take notes in the book (if you own it or it's digital) or in a separate book. Look at things like: how much dialogue is there? How much action? How much internal dialogue? By whom? How often? This will give you a feel for how much to put in your book.
- Read more fiction bestsellers. Yes, I know, bestsellers aren't always the best written books, but they have things called hooks that you'll need to use to attract readers to your book.
- Develop a genre of your own. Dan Brown is used all the time as an example of a writer who sells lots of books despite not being in say Ross Macdonald's or Mary Stewart's class. How does he do it? He invented a genre of his own and people who want to read religious thrillers flock to him.
- Get a tough beta reader or join a critique group who will be honest with you about what needs to change. Besides reading, being critiqued by tough judges is the fastest way to jump from non-fiction to fiction.