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Aha, now I have found this information right here on this page:
which explains: “This ID must be different for every file! In other words, even if just one requirement has changed, a new ID must be used.”
Reading the spec once again, I see that REQIF-HEADER is not an “Identifiable” with respect to section 10.2
This means to me, I can use the IDENTIFIER of the REQIF-HEADER to distinguish between my subsequent exports. I also found out, that ReqIF-Studio does not alter it during export, so this seems appropriate for my purpose.