I would imagine you are right, fixing one would change the other. I would have thought by altering the angle of the neck horizontally at the joint the tiniest bit this would alter the string spacing, and you would aim for the spacing to be consistent both sides all the way down. Of course if that pic is the neck gluing in its a bit late!
I don't think you can alter the bridge horizontally, the only way would be to redrill the post holes and I wouldn't do that...