Knowing origin of Polygon

[gsohler]

I'd like to use Clipper2 with more attributes.

Lets say I have am performing an difference of 2 polygon sets like

Result = A - B

A shall exist of 4 rectangles labelled next to each other, labelled from 1-4 and B shall cut all of them into 2 pieces so the Result
contains 8 Rectangles.

Is it possible to determine from the resulting 8 rectangles which original shape(1-4) are they coming from ?

Alternative is to do 4 differences, (but is that as effective as doing 1 difference) ???

thank you for the answers