As yo says it’s a small world, I have shown things in interviews that were not released, but at the time it was for industries that were wholly different from anything I had worked on in the past, and I assumed that risk. I have former colleagues who had shared work during an interview and the director of company X wound up being good friends with his boss, and immediately called him up to let him know what he had just seen.
The only thing that could save you is if any part of the project has been publicly revealed. Once that happens you can consider the project itself public domain although the development work you did is still covered under NDA. It really depends on where you work for and how serious they are. If you were to share the iPhone 11 design you’d likely be fired within 45 minutes. If you work on point of purchase designs for trade shows, chances are no one would know the difference unless you were going to your nearest competitor for an interview.