I was there when these two sparred back in 2010.
Fury later said that Joshua beat him up but this wasn't the case, tbh.
They boxed 6 rounds and there wasn't much in it...more holding and grappling with Fury woofing like a small dog on occasions trying to unsettle and unnerve the less experienced Joshua.
I think its a 50/50 match up if they fought now. In a year or so, Joshua will KO him.