The pinouts are the same with the exception of the audio output ports.
Appropriate information appears below.
Do not connect any RS-232 device to this connector. Doing so can result in damage to both the device and the Macintosh. Can be set in software to be a second external clock. Miniature mono phone plug - The internal speaker is disabled when this port is in use. Stereo miniature phone plug - The internal speaker is disabled when this port is in use.