If the only thing that's different between those pages I'm sure that they're going to be considered to be duplicates--I don't even have to look at the pages to tell you that.
If you can change the URLs, that's definitely preferred. There are other things that you can do to make sure that they're not duplicates, which is to add more content to the pages. You could use RSS or other text--even related links--to change the pages.
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