Showing as duplicates but they aren't duplicates

I’ve got a two PDF’s which I just scanned and are very similar. They are two pages each and the first page is identical but the second page is different. How do I stop DT3 as seeing them as duplicates and marking them in dark blue? Marking stricter duplicate check in preferences has no effect. Thanks.

Do both have the same text contents? See e.g. result of Data > Convert > to Plain Text

Ha. There was no text from the second page (which is only 2 lines) on either of them. I rescanned them both and it now it’s reading the second page → fixed. Thanks.