I don't have any websites to link to but I have read about it a little on the internet. Epigenetics is very interesting. Scientists are still trying to understand how it all works. But your baby will turn out differently in your womb compared to if the baby was carried by the donor.
I read about an example in horses and ponys. When a pony embryo is placed in a horse the resulting baby is a larger sized pony compared to a pony carried by another pony during pregnancy.