Control columns on all Boeings are mechanically inter-connected, so even on FBW aircraft they are most likely to give the same commands to FBW system from either left or right control culmn.
There is usually a breakout mechanism, with enough force you can disconnect the columns and then you have indeed the case that different control surfaces get their commands from their column, or better said each side controls only a portion of them.
On Airbii of course you have either arithmetic summation of both control inputs or you can disconnect the other stick with the priority button.