OMC/Johnson/Evinrude and Mercury did have their own proprietary cables. When Yamaha entered the market they adopted the "universal" cable used on inboard engines, the Morse "33c" (Teleflex 3300) and its big brother the "43c." Other outboard manufacturers like Suzuki followed Yamaha's lead.
The Teleflex 33c Extreme cable is an improved 33c
To make things even more interesting Teleflex bought Morse and then spun off the marine divisions as "Sea Star Solutions."
I would be surprised if the Volvo cable was anything but a Volvo branded 33c cable. The "universal" 33c type cable has 10-32 threads on each end, the ends are same/same.
This cable is made by many manufacturers and Sea Star makes them for several manufacturers. Typically the jacket color is the only difference. Red was Morse, Silver was Teleflex, Black was SeaStar, Gold was North Wales, there is Blue as well.