How to isolate an object from its background when you have the isolated background already?

So I have multiple objects that are all on the same background but I only have them as flat images and also the background image alone, thought with some blending magic (“Difference”, “Color to alpha/transparency”, etc..) I would be able to isolate said objects from its background. But no luck on my part and googling didn’t help me either.

I am talking of course about a half decent, automated color maths kind of thing. Sure I could extract all of them by hand but its not viable in this case.

Is there a way? Plugin maybe?

Here a kind of flowchart of my problem:
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Source : Link , Question Author : pspsps202020 , Answer Author : Community

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