The MacBook Pro internal SuperDrive uses a standard SATA connector. You should be able to use any SATA > USB cable to mount the SuperDrive externally.
It was a common modification to replace a MacBook's SuperDrive with a second Hard Drive. Those people then had the option to use the SuperDrive externally, as in the video below:
Connect your Macbook ...
Why not just get a carrier for the SuperDrive?
Saves you from opening or worrying about the mounting and internal cables on the second Mac.
There are less expensive cable options to get SATA to USB as well:
If you can't remember your firmware password or passcode, schedule an in-person service appointment with an Apple Store or Apple Authorized Service Provider. Bring your Mac to the appointment, and bring your original receipt or invoice as proof of purchase.