We know because the similarities are too great not to get them, and I believe he must have made some references (although this is not my area of expertise). He also did a reworking of Goya's Three Majas. He was very upset because few of the Parisians in 1863 "got" his references and were just upset at the blatant nudity.
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Thanks. I enjoyed the art lesson.
Goya's Maja desnuda is far more effective, IMHO, but I have always liked Goya better than ANY of the French impressionists (except maybe Renoir). Besides, she looks like she is a girl who enjoys a good time and has a twinkle in her eye . . . unlike Olympia who as somebody said just seems to be saying "Next!"