You can use two different models to achieve that, but that is not a good solution and not suggested to do. Other option: you can use macro. use two sets of variables/ bookmarks to hold the selection history of a page which would be captured "OnLeaveSheet" action (in trigger) by running the macro.
What santhosh has mentioned is correct. If data is fetched from the same data model what ever selections that you make in one sheet holds true for all the sheets irrespective of the number of sheets in qlikview document.
