The Kindle treats side-loaded books the same as Amazon purchased books, with the exception of the online archive functions. On the device itself, side loaded content gets the same placement on the home screen and in Collections. Based on the threads I've read on MR, the sames is not true of the ColorNook.
https://www.mobileread.com/forums/sho...d.php?t=107521
https://www.mobileread.com/forums/sho...d.php?t=107318