Welcome to the NICOClub Rogue forums matron820!
To answer your question: You cannot simply swap head units. The BOSE system uses an external amplifier and a different wiring harness. A successful swap would require swapping nearly all of the audio components and the harness. This is neither cheap nor easy to do.
IMHO, you would be better off to upgrade your head unit with a quality aftermarket unit. The Rogue is blessed with a Double DIN sized radio so there is a huge selection of head units to choose from. I particularly like Kenwood units as they use Garmin's excellent nav interface and maps.
Expect to pay from $600-$1000 for an aftermarket Nav unit depending on options.
BTW, if you think this is expensive, a replacement Nissan head unit with NAV costs
$3100!
