Solution 1:

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 superdrive / optical externally via USB

https://www.youtube.com/watch?v=UEcpomwJbHc

Solution 2:

Why not just get a carrier for the SuperDrive?

  • https://eshop.macsales.com/item/OWC/VLSS9TOPTU2/

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:

  • https://www.newmodeus.com/shop/index.php?main_page=index&cPath=17