20-25 percent larger.
If 5’ 10” is average for today, then they would have been 7’ 3” tall on average.
Assuming the owner of the skull was of average height. It’s also possible he was the Andre the Giant of his people.
The brain size of this and several neanderthal skulls is also larger than modern humans. They weren’t dumb either. It would help to be big and smart if you lived 300,000 years hunting mammoths and mastodons with sharp sticks and cave bears and saber toothed tigers around to compete with.