Impossible to provide an answer without additional information. Traditionally, the best stereo imagery ias created with not just identical, but "matched" lenses. Primarily so that transmission characteristics, chromatic & other abberations are the same and etc.
Shutters were linked mechanically and the most accurate were guillotine.
All this to expose two frames on the same emulsion for exactly the same time with exactly the same transmission chracteristics.
Now to the question of is it possible to use two different cameras for stereo work?
The only way to test the synchronization is to test the synchronization. They either will or they won't.
Of more complexity is "can I use them for stereo?"
Chances are there are significant differences between them. The have different glass, different sensors, possibly different focal lengths at the widest, different software converting the RAW to *.jpg, possibly even different resolutions.
So, will you get two images if they synch? Yes.
Will those images be matched closely enough for stereo? Maybe. Maybe not.
Obviously, you can always put the pair in Photoshop and spend the time to match them for exposure and color balance and image size, but depending on the differences, this could be a significant outlay of time.
Rather than worrying about whether they will synch or not, just put the two of them on a tripod, shoot the same scene with both and see if they will be useful for stereo or not. No one here can answer your questions about framing and whether they will be usable without you trying it.