They have the exact same style, are both southpaws and are both equally talented. The difference is Luis Ortiz is way bigger and punches like a truck. Ortiz would beat Usyk by decision. Ortiz would knock Joshua out cold.
Wouldn't call their styles even all that similar, aside from being southpaws, let alone being "exactly the same".
Also, there's one glaring difference between the two. Usyk has beaten elite fighters in two divisions. Ortiz has never beaten anyone better than a gatekeeper (Jennings) and lost to a champion with the weakest resume in living memory. No, there's nothing remotely comparable here.
Ortiz is actually shorter, despite his false height listing, and is hardly that much heavier. Maybe 5 pounds at the most if he were as lean as Usyk.
Southpaw yes, equally talented no. If Ortiz was as talented as Usyk, with his power, he would have been ruling the division for 10 years.
And what did he do instead? Fight mostly journeymen and the odd gatekeeper, turn down the man Usyk just beat and lost to Wilder who isn't exactly a generational talent when it comes to technique or ring IQ.
Even in his prime (about 40 years ago) Grandad Ortiz was way slower, way less skilled and just completely rubbish compared to Usyk.