it really depends..
Some codes will say "this also includes a copy in Itunes"
they will give you a window on the left for UV retailer. Then on the right for Itunes.
Others will only let you redeem in one provider, single window.
The Crimson Peak was both
Pm if you wish
UV Vudu or Flixter HDX
Ironman 1 and 2
Thor 1
Disney Others
Sword in the Stone
Alice in Wonderland
Beauty and the Beast
Highlander movies
Mostly 1
Steven Segal
under siege
marked for death
etc
Tombstone(Kurt Russell Etc)
Escape from New York
Showdown in Little Tokyo...