Formula One
Two other notable F1 drivers (modern era) actually ran more races than Kimi. The 1997 F1 champion, Jacques Villeneuve (who ran in a bunch of different series around the world), ran four Cup races, nine Xfinity races, and seven truck races. He never won but did score four top-5's in the Xfinity series.
But the most successful F1 to Nascar driver was Juan Pablo Montoya. After six seasons in F1 (Williams, McClaren) where he won seven grand prix, including Monza and Monaco, he was lured to Nascar by owner Chip Ganassi. He ran nine seasons for Ganassi, winning two races (road courses) and scoring 24 top 5's. His highest point finish in Cup was 8th in 2009.
Only Graham Hill, Mario Andretti, and Juan Montoya have won both the Indy 500 and the Monaco GP. Hill also won LeMans, considered world auto racing's Triple Crown. But Andretti won a Daytona 500, giving him his own highly incredible triple crown. AJ Foyt also earned a triple crown of his own by being the only driver to ever win an Indy 500, LeMans, and the Daytona 500.