Can't be done. Completely different formats, and the two "think" about and build the accompaniments in an entirely different manner.

Insights and Incites by Notes ♫
Brand new 2012.5 updates from Norton Music:
  • 2 new style disks for Band-in-a-Box
  • 2 new free (with a purchase) fancy intro/ending disks for Real Band and other DAW's
  • The Ultimate Gospel Fake Disk
  • The Real Rock Fake Disk (plenty of classic rock in this one)
  • The Beatles Fake Disk
  • And an updated Christmas Fake Disk

Hundreds of Free .sgu and .mp3 demos for the above at: http://www.nortonmusic.com