>if any epigenetic chromosomal markings are more associated with one sex or anything like that.

Yes, this is the main thing that separates animals like ligers (M lion/F tiger) and tions (F lion/M tiger) as well as mules(M donkey/F horse) and hinnies(F donkey/M horse). Biologists wondered for a long time why these hybrids were so different depending on the sex of their parents, with the only significant, apparent factor being different womb environments. As it turns out the epigenetics differ depending on sex, which significantly effects the development of offspring even if the genes they received from their parents were the same.