OK, read myself a little more thoroughly into this materia and came up with a solution myself which fully satisfies my needs.
Instead of somehow importing the key column into one of the sheets and then start comparing on one sheet, I found a solution to step through each individual key column of each sheet and then check the correlating column on the sheet if a cell with such value exists, and if yes, delete it.
Actually a quite simple process, i just happen to see it way too difficult in my head ^^
Hope this approach helps someone else as well,
A2k
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