External functions and FCMP functions can have the same name as long as they are saved to different packages. When these packages are loaded, a warning message in the log identifies which package contains the default definition for a given function. To use a function definition from a package other than the default, call the function using package-name.function-name.

When you load multiple packages of external functions, all function names must be unique. If two or more external functions of the same name are loaded, the first function that is loaded will be used. Duplicate external functions are ignored. A warning message in the log indicates which package contains the function that will be used, and which package contained the discarded definition.