[beliu]

It's hard for me to say without more details about your specific problem. srclib does provide a Data field where information like method signatures is typically emitted, so you can compare the signature for the C# method with that of the Java one, but I'm not sure if that includes the other attributes you need to know for your problem.

If there's a lot of custom logic, then it might be better to write an ad hoc tool that checks the AST of the Java against the AST of the C#. srclib and I think also Kythe are designed for building tools that want to be language-agnostic, rather than digging into specific language behavior.