If it's not included in robots.txt rules and doesn't have a canonical link that's not a problem, because the bot can't know if those pages are different or not so those pages you linked are different. This is the reason why crawlers can't try to fill forms.

If you are really sure that these pages are the same, try checking the body content (if two or more pages have the same MD5 of the content, those pages are the same) or look for a form that generate those URLs.