Yes, but no one acclimates as well as the Sherpas.
This is definitely seen in pregnant women in Tibet. Women of Han Chinese descent who have lived their entire lives at the same altitude as Sherpa women nonetheless give birth to their babies earlier, and those children are typically a pound or more lighter than Sherpa babies at birth. Because of this, non-Sherpa women in the higher altitude areas of Tibet are encourage to descend to a lower altitude for pregnancy and birth - it makes for healthier babies.
Go back and actually re-read my post - the Sherpas do NOT have larger lungs and heart - their lungs and heart are the same size as lowland individuals of the same height. It is the natives of the Andes, literally half a world away, who show larger hearts and lungs.
And some Sherpa adaptations, such as reduced sweating and higher rate/deeper breathing at night, are NOT seen even in the best aclimated individuals of low-land ancestry. They ARE seen in Sherpa descendants born and raised in lowland areas, however. These are subtle but inherited differences. It’s like Inuit tending to be short, compact, with limbs and fingers relatively shorter than, say, the Masai, who have inherited tendencies to be tall and lean. All of those groups - Sherpa, Inuit, Masai - show some genetic adaptations to the environment their groups have been living in for a long time. An Inuit adopted by a Masai family and living in Africa is not going to suddenly grow six and a half feet tall and be rail thin - he might be thinner than his cousins in Nunavit, but he will still retain the genetic traits that makes him marginally more adapted to the artic than his adopted family. Likewise, a Masai growing up in Barrow, Alaska will still be tall and relatively thin compared to his neighbors. Sherpas ARE adapted to high places in a way I (as an example) am not, and never will be.
The Sherpa adaptions are not enough to make them another species, but they are enough that it is believed they are the reason there has never been a known case of fatal high-altitude pulmonary or cerebral edema in a Sherpa. Then again, very few Sherpas seem to have a need to spend time on what they call the “big headache” mountains, whereas thousands of lowlanders have pushed themselves past their limits, ignoring little warning signals like extreme pain.