ValidationException class: Custom class vs FluentValidation class

[smariano88]

FluentValidation library has this class:
https://github.com/FluentValidation/FluentValidation/blob/7604dc9114183aa302e1374e5a96dbfdb42a659d/src/FluentValidation/ValidationException.cs

And the template creates a very similar one:
https://github.com/jasontaylordev/CleanArchitecture/blob/413fb3a68a0467359967789e347507d7e84c48d4/src/Application/Common/Exceptions/ValidationException.cs

I was wondering what's the benefit of creating a custom class instead of using the one that comes in the FluentValidation library?
Is it to have more control over it or is there something else?