MasterPages and auto-flow text

Is it possible in PageMaker to have left & right MasterPages with
slightly offset left & right margins AND be able to place a multi-page
story from the text editor onto page 1 and have PageMaker
automatically select the left and right MasterPage as the text
auto-flows flow page 1 to 2 to 3, etc.?

I currently have a 2-page MasterPage. When I change the margin setting
it changes it on both the left and right pages. Ideally, I would be
able to set the margins on the left & right pages separately.