In 2016 my mate Tom managed to move our seats for Villarreal at home from the main stand to the Annie Road when extra blocks became available. Not sure whether they will have changed it now but we had to call up the ticket office whilst having the tickets that we wanted already saved in our basket. The woman on the phone managed to sort it for us from there (but as with most things with out ticket office it depends on who you speak to and which side of the bed they woke up on).
Good luck mate, let us know how it goes so I know for future reference.
