Double a PDF file, but the size increases

I have a 4 page PDF called TEST of the file size 4.2 MB with 3 images. When I do a new PDF of 2 copies of the TEXT by using create a PDF from multiple files, the size of the new document increases only 4.3 MB, yet it has 6 images instead of three.

How is that explained?

Are the identical images? If so, it refers to the first to the second.

Tags: Acrobat

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