You would have to favour Hrgovic here for the decision. However, there is always the possibility that AJ gets the decision because Hearn always ensures he pulls some strings when it comes to the judges for AJ fights.
Joshua by decision - and wide. Joshua's chin isn't A1, but it's plenty for Hrgovic's limited power. Then you're looking at points - Joshua at 90% of his Usyk fights would win easily, Hrgovic doesn't have the gas tank to get close IMHO. Declined legit contender Vs career gatekeeper - you got to favour AJ unless he's seriously seriously shot.
I can say that Hrgovic can beat Joshua because Joshua failed to win a single round against Dubois. While Hrgovic managed to lead on points in the fight until Dubois stopped him, styles make fights, Hrgovic has a habit of neglecting defense and Joshua doesn't have a good chin, I will choose Hrgovic on points in a very interesting fight.
I can see Hrgovic at least having some success with his one-two early on but the tide would slowly turn into AJ's favour as Hrgovic gasses out and I think AJ would get the decision here.
AJ probably stops him at prime. Now ? It would be a good test as to which one of them needs to retire.