no, on gravel you have friction, and inertia doesn't bite you in the ass (friction of the other rocks, your tires etc.) Snow, on the other hand, packs and acts like teflon.
In my area, we got a couple inches, and it makes going to work interesting to say the least. Heck, Turning out of the alley my garage is in makes me fish tail at 5mph in my truck. Leaving work, I have to engage 4wd just to climb the hill behind employee parking.
Whereas gravel i can intentionally do a power-slide at 30mph and not fear for my life.
My mom had this dodge omni when i was in high school, and once she parked in a iced over parking lot, when she got back from her shopping, she got in the car, and closing the door was enough to start her sliding sideways 40 feet into a snow hill and embed her 1/4. took a city plow truck to pull her out.