I want to thank all who took time to answer my plea. When I asked the question, I assumed one of the two Marie did not exist because I had found the birth record for Marie 1 borne 1598 but not that of Marie 2 borne 1599.
However, further research brought me to Nicolas, the brother and Fichier Origine did list Marie 2 with a ref. for birth record; although I still cannot put my hands or eyes on such record, I am happy to accept that Marie 2 existed.
It would be nice to include the reasoning behind acceptance or refusal of a match on the profile until such profile has proof of all basics.
Anyway - Thank you all !