There was a site with a good list: abcdlist.nl But that site went offline, I believe the owner passed.
Then there are the lists compiled by
planelist/airlinerlist. They have the full A330 production list in a spreadsheet, including all the tankers. I just don't think they have the customer codes.
And then of course check the pictures of Getafe on all the photo sites.
And... then compile that into a list and keep the updates here, based on the list Flyboy started 2 years ago. It will certainly draw more interest and others will chime in with info like back then. That will help everyone. "Don't ask what you country can do for you, ask what you can do for your country" or some variation on that...