I think they can get pretty close. They’ve reconstructed modern skulls of unknown missing people which were later recognized by family.
What is interesting to me is the date of death and the location of a well-worked cross that far north in England. In the seventh century Pope Gregory sent missionaries to England to revive a flagging church. Augustine of Canterbury (early 6th century – probably 26 May 604) was a monk who became the first Archbishop of Canterbury in 597. He is considered the Apostle to the English” and a founder of the English Church.