Please pardon the bad grammar in the heading!
You can copy and paste groups of layout objects from one tab panel to another.
You can use the Inspector's position tab to compare the position of different layout tabs and enter new values to make the position of the obects exactly the same on their respective panels. You can also group a set of objects so that you can then see and adjust their positions as a group rather than as individuals.
Note that you can click the units to the right of a position box in the inspector to change the units. Click enough times and you'll get points instead of inches or centimeters and this will make precise positioning of your layout objects easier.