Every time you give the command to restore in iTunes always download the latest version and install it, once done that if you do not want to delete the place where it is. This also applies to a new system, if you want to perform a clean installation.
For minor upgrades, it is best to perform in the iPad, because they are usually very small, less than 100 mg, however when you do it from iTunes the whole system down you seem low and installs the update, and you can do the same searches and delete the folder after installing. That if, if you are upgrading again in another similar device again have to download the deleted file.