Setup different pager settings for same view
I dont think its possible, you can achieve this by adding another page/block display to an existing view and specify the pager values accordingly. 



As Ursula said, When you change your pager on the second display, do not forget to change the 'for' pulldown menu on the modal window from 'all displays' to 'this page (overwrite)'. Otherwise, you changed the pager for all displays.