How to validate references between two assemblies?

AssemblyA.dll refers to AssemblyB.dll

AssemblyB was rebuilt with new code, but not AssemblyA. Therefore, we no longer know for sure if AssemblyA is compatible or not. Maybe it will crash at runtime because some method or property was removed.

Theoretically speaking, is it possible to validate whether AssemblyA is compatible or not with AssemblyB, without having to actually rebuild it ?