Once duplicate content found, worth changing page or forget it?

[SpecialCase]

Hi, the SEOmoz crawler has found over 1000 duplicate pages on my site. The majority are based on location and unfortunately I didn't have time to add much location based info.

My question is, if Google has already discovered these, determined they are duplicate, and chosen the main ones to show on the SERPS, is it worth me updating all of them with localalized information so Google accepts the changes and maybe considers them different pages? Or do you think they'll always be considered duplicates now?

[Theo-NL]

Changing them will definitely still matter! Google will periodically visit your (and every other) website to see if content has changed, or new content can be found. Once you make sure the content isn't duplicate anymore, Google will discover this and might (or might not) act upon does.