No, they're not. If gender and sex meant the same to those concerned, there would be no demand to change "mother" to "birthing parent", since all birthing parents would be understood to be mothers (as indeed they are and we all know they are, and as they have been described since the word entered the English language). No one would have the ridiculous expectation that a man would try to nurse a baby on his chest, so no one would replace "breastfeeding" with "chestfeeding" - even more idiotic because men have breasts anyway, and are diagnosed with "breast cancer" not "chest cancer". Etc. You have it entirely backwards. The gender cult has hypnotised you.