I went from bikes to cars. I raced bikes most of my life. From 125cc 2 strokes to 1000cc 180hp superbikes. The biggest thing with me was trying not to lean in the seat of the car, like I would with a bike.
I still catch myself every so often still trying to lean.
The other thing is my braking points between the bikes and car. I have to brake a lot sooner with the car.