Yes. The difference between morphine and heroin is that how much more fast and efficient heroin is at penetrating the blood brain barrier. That's why you want the heroin in your bloodstream all at once and as quickly as possible. That's why most people inject or smoke it.Yup BA is basically an inbetween of snorted and oral. There’s more getting straight to the blood stream than oral, but obviously not as much as snorted.
The closer you get to oral administration, the more heroin becomes essentially morphine with a higher BA. It loses that effect that makes the esters like heroin so damn good.