If the compiler sees both the declaration of the subroutine and a call to it in the same source file (or if checking interfaces has been selected) it can check for matching subroutine argument types. By changing the name, you disabled this capability of the compiler. If by "It just works" you mean that the compilation completes without error messages, you are asking for trouble later (at link time or run time). Instead of trying to deceive the compiler, fix the problem.
