Don't know how about Android, but for iOS you can use targets and then set which files should be used by selected target. Each target may have its own Info.plist file, different graphic assets and more.
Start with duplicating an existing target:
You will notice Info-copy.plist file, which is a setting file for the new target. Then use a proper scheme to run your new target:
If it's not there, go to "Manage schemes" and press "Autocreate schemes now"