Is it known how similar they are besides for culture, i.e. would an infant from there raised among humans or an infant from us raised by them be able to learn the culture? Has anything similar been tried with other isolated tribes?
These people are humans.
Given that humans only evolved around then, it's reasonable to ask about tribes that split off.
"modern humans evolved in Africa possibly from Homo heidelbergensis, Homo rhodesiensis or Homo antecessor and migrated out of the continent some 50,000 to 100,000 years ago"
https://en.wikipedia.org/wiki/Human_evolution
I suppose this could be mostly answered with a DNA test, on further thought.