The unconverted member and the member for the converted output can only have the same name if they are in different files or libraries.
The name of the converted source member(s) depends on whether you are converting one or several members. If you are converting one member, the default is to give the converted source member the same name as the unconverted member. You can, of course, specify a different name for the output member. If you are converting all source members in a file, or a group of them using a generic name, then the members will automatically be given the same name as the unconverted source members.
Note that specifying the file, library and member name for the converted output is optional. If you do not specify any of these names, the converted output will be placed in the file QRPGLESRC and have a member name the same as the unconverted member name. (The library list will be searched for the file QRPGLESRC.)