From everything I've ever read, Desai is a Fangio disciple through and through. Some people will hate that. It's where the league is going.
The biggest difference between Gannon and what I expect from a true Fangio guy is deception. The philosophy of prioritizing not giving up big plays is the same, but Fangio/Desai try to confuse the hell out of QBs. You'll see a ton of stunts and post-snap motion.
It's important to acknowledge the limitations of what we can actually know, but both coordinators look like damn good hires from the outside.