If both are installed and none is running, you can select which player to initialize.
ATTENTION: Although it shouldn''t be allowed (there''s an "information file" included in every app), some ROMs/devices might install this app to SD. This often causes the Widgets not to be enlisted in Widget selection. In this case, please move the app to main storage (you can do this with some entry in the system preferences).
If you experience troubles like weird display or nonresponsive widgets, try to remove an re-add the widget.