I suspect the fact they are both red and Italian is the only common factor.
Ducati have been run by Audi Sport for a few years now and have a strong bike. They didn't have that when Rossi was there.
I feel the problem over the last few years is they haven't had a 'alien' in the team like Marquez. Dovi is a really good rider, just not in the 'alien' catorgry like Stoner was.
Watch the Ducati over the next few races at circuits that will play to its strengths.
Watch out also for Miller and Bagnaia on the Ducatis, they are showing signs they might turn 'alien' as Quartararo has done for Yamaha.