https://www.boxingscene.com/golovkin-sparring-i-learned-murata-very-serious-fighter-high-boxing-iq--164844
So he knows what he is up against, a serious fighter in Murata and he would have to travelled to his home town and beat him. So this is a very dangerous fight for GGG.
Oh really, they did that in the past? That's good because even it was just a friendly spar, they could already tell each others capabilities just like how GGG felt about Murata. I only know that Murata was always looking up on GGG and something he said that it's been an honor to get a fight with GGG. Nonetheless, the number still cannot lie and we definitely know that GGG has the advantage even if he's much older now.