Why Google Shows Different Results by 10 and 100 per page?

Most of the time I have analyzed that when I enter my query in Google search box and see the results by 10 per page and with the same query when I see the results by 100 per page than results are very dissimilar after 5 positions.

I want to know how Google works when we see results by 10 per page, does Google use any kind of filtration during instant results or shows real time by 10 per page.

And why 10’s and 100’s SERP results are different from each other?

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