There is no difference in the applications, just the licensing & the price. All of the iWork '09 applications function the same whether they're installed via the downloaded trial, the retail disk or from the Mac App Store, single-user or family pack. The main difference between the full iWork suite (downloaded trial or retail disk) & the Mac App Store versions is the MAS versions, if you were to get all three, take up more disk space because they don't share resources.
The iOS versions do lack many features of the desktop versions.