In this late 1970s loop, XNK8644 (https://www.egafd.com/actresses/gallery.php/id/X08644) is most certainly the same as XNK2829 (https://www.egafd.com/actresses/details.php/id/x02829).
Her male partner (the second unidentified guy) in both cases was a German performer listed in IAFD as Unknown Male 733719-C
(https://www.iafd.com/person.rme/id=0b49 ... 6e0fc48013). He is most certainly the same guy as Unknown Male 221135-A (https://www.iafd.com/person.rme/id=f434 ... 462b01a7e0).