In all honsety,don't try too hard to get ideal numbers with your meter. From my experience,there will be a need to do some work on the intake to equalize mixtures from cylinder to cylinder. Then staggered jetting can help a little. When you stagger jetting,you affect more than one cylinder. You may get one too lean trying to get another one ideal.
Basicly,don't drive yourself nuts trying to get things perfect. If you don't work on each cylinder individually working with egt's or O2 sensors in each pipe,you will never get each cylinder perfect. SO there will most likely be a difference from side to side. The amount of difference depends on too many factors to give a generic number.
Keith