breast changes after baby

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I've been curious about this and don't know who I can ask since not everyone is as open about stuff like this as I am.

I'm curious whether those who do not breastfeed after having a baby end up with the same changes in their breasts as those who do. I'm talking about them feeling super empty and being more floppy than they were before, as well as some sagging (I know that varies between people and can happen without breastfeeding as well). I guess I'm curious if it's the changes that happen during pregnancy and the initial engorgement before the milk goes away that causes them, or if it's the constant filling and emptying of breastfeeding that does. If it's the former, and your milk never comes in, are they the same as they were before being pregnant?

(this is not intended to be a discussion on the merits of either method of feeding, I'm just curious on a purely physical standpoint)