First time, he won in McLaren 2008 and later he won in Mercedes 5 times (2014, 2015, 2017, 2018 and 2019).
But yes, it's very difficult to win World Champion's title in 2 different cars.
Maybe Verstappen can do it as well but he'll probably stay at RedBull. I don't see him changing teams any time soon.
Great race from Ferrari after all, especially at home.
Hopefully, Ferrari can gain some confidence but I mostly believe it's track related as Ferrari has been doing well on fast tracks, like Azerbaijan earlier.