Different size for apk files

Why does an apk for an app from F-droid and original source ( like github ) have different sizes?
For example, I downloaded blokada apk from github and F-droid. Shown below is the size details for them.

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Because the app is not ā€œBuild Reproducibleā€.

Why does this matter?

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Sorry for asking but Iā€™m more or less a paranoid guy. I do take great note of such things.

Does the reason have anything to do with the optimisation settings for the software used to build? Iā€™ve only compiled dlls before so Iā€™m a noob when it comes to app building.

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Because this is not built by the developers but by F-Droid. So tools versions might not perfectly match up, hence small differences.

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If you want to look into what exactly the difference in those two apks is, I can recommend taking a look at https://diffoscope.org/.

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Thank you for providing that link

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