It's impossible to compare.
For those you mention, I'm certain Neil Fox would be a major force in the modern game playing exactly the same game with the same physique. However, even though he is one of my heroes, Derek Turner would be less likely to be as successful as he was in the 60s.
I'm sure he would be great if he was born in this era because his mental toughness and will to win would stand him apart but he couldn't play the same game he did, and he wasn't that big either in weight so would be pushed about like an Annakin. And that is hard to say. Same would apply to Henry Cooper or
I have the pleasure of spending a lot of time with the legends who watch Wakefield. I was with Ken Rollin, Ian Brooke and I asked them if they would like playing the game today. Ken said the opportunities are massive in comparison to what he earned and it would be great to play in this era with the modern training and no one knocking your head off after you pass. He said he thought it would suit his style of play too, but he would have to train differently to be stronger.
Ian Brooke said he'd like to as well but said his only request was that Don Fox was in his team. He said he thought he would be perfect for the modern game and said he would score tries for fun outside him as second row.
Neil just smiled and nodded at what the others were saying. (He knew he'd be great!)