If you reserve early enough, you will probably be able to get the same cabin. I recommend a good TA to explore all available cabins for you. The Musical Reviews will be the same on both legs of your B2B, but the guest entertainers may be different. It just depends on how they rotate their entertainers from port to port. Princess has nothing to compare to the Freedom class ships - fantastic things to do for your age groups. I prefer RCI, but that's JMHO.
Rhapsody - W. Caribbean - 2004; Rhapsody - W. Caribbean - 2005; Sovereign - Bahamas - 2005; Enchantment - Canada/NE - 2005; Rhapsody - W. Caribbean - 2006: Vision - Alaska - 2006
Navigator - E. Caribbean - 11/2006
Vision - West Coast Repo - 4/2007
Grandeur - Canada/N.E. - 9/2007
Voyager of the Seas -"R"W. Caribbean - 1/2008