The PSP version, named "To LOVE[Ru] Seaside School Compilation, will differ from it's DS counterpart.  Unfortunately not a lot of details have been released about the PSP Title's gameplay, but the images released from the game differ greatly from the DS version.  My guess, based on the small amount of info available, that the PSP edition will be more of an adventure style game similar to Japan's Dating Sim genre.  The PSP version will be hitting store shelves September 25 2008.

Both games will be released in standard and limited editions.  Standard editions will cost around $55 each and the Limited editions will be about $80 each.  No details yet on what the limited editions will have within the package.

Pictures courtesy of Dengeki.

DS Cover and Character Image from within game:

PSP Cover and Character Image from game: