I have two keys bound to increase and decrease the prop levers.
But in twin-engine aircraft the two levers get out of sync soon. Holding down the key I can literally watch one lever go a bit faster than the other. If I don’t pay attention I soon hear it in the sound of the engines, and the RPM gauge also shows the difference. Then I correct one of the levers.
Does anyone else observe this?
I have it in the C310, my primary aircraft, but AFAIK it only represents what the sim gives it.
Yes, same issue on my end. It happens with C310 and default King Air 350i (the only two I tested)
And it also has some random factor because sometimes it works just fine.
Welcome to the forums! 
Thanks for your reply. I wonder if anyone knows more!
The C310 checklists even list sync props manually.
Seems like it’s not a new issue:
Yes I observed this on nearly all aircraft for as long as I can remember.
And in fact even simpler, I use a single key to control prop pitch (when the yoke and throttle are not connected).
Most of the time if there are more than one prop, the pitches are not aligned even using a single key.
So I will then do it manually with the mouse on the actual cockpit levers.
I have yet to observe if there is a relation to something like the winds.
I don’t think so. I will check it though.
Having said that, the reason I’ve never mentioned it before, is that I quite like it, it makes you double check they are aligned etc.
But still, pretty sure it should not be that way.
You develop the ability to hear it if they aren’t.
Yes pretty easy to hear that, as it is irl tbh.