In a team I was a part of some years ago I had the distinct feeling of being able to tell which one of my teammates wrote what code.
Something in the favorite methods to solve problems, variable names and so on (it was in Python where you have 100 ways to solve 1 thing!)
I think something very distinct and easy to pick is how they think, at least in the board term of OOP vs functional.
I’ve seen Go code being forced to do OOP and functional JS… it’s fascinating!