Different Camera manufacturers rarely follow a common standard for communication protocols. Neither for those components that you have access to regularly nor to internal ones.

• The pins of a Canon TTL hot shoe (that's what you attach the flash to on top of the camera) will not talk to the pins of a Nikon TTL flash.
• The pins on a Sony Lens mount will not make a Canon lens focus.
• etc.

Now for internal components, they have to take care even less. If there's an advantage in creating an entirely new shutter unit for a new camera model, so be it. It's not like shutter units have to be back compatible with previous camera models like lenses do.

Sure, from a manufacturing standpoint it makes sense to have certain aspects in common to reduce costs, but keep in mind that the shutter is also a feature to differentiate camera models. Some are rated for more and some for less operations.

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They likely use some existing bus system. They probably have some custom protocol to operate the shutter. You can try to reverse engineer the protocol if you connect the shutter to a camera and operate it while monitoring all the contacts.

For more information on that, check electronics.stackexchange

From an engineering standpoint, the idea looks good on surface: reusing an existing module. But there's no guarantee for supplies and you are relying on the availability of spare parts for a camera model that is not in production any more. Good luck if your unit breaks.

This is not rocket science. All you have to do is close a gap of a few centimeters.

custom built shutters with razor blades that move ~1mm

You should be able to improve this. Use an electromechanical solenoid or a rotary disk shutter for example.

If you need help designing a shutter, try asking at engineering.stackexchange but make sure you include all your requirements to ask a proper question.