The first set of numbers is Width. 2nd is Aspect Ratio (% of Width). 3rd is Rim Size.
195/55/15 is 1 cm narrower. And Slightly smaller Sidewall height.
The problem I see is, The TPMS. Unless your reusing the factory rims, You need the sensors and have the car programmed. Then do the same(Reprogram) when you change to "Summer" tires.
On a Side note, The Stock Tires 205/55/16 Suck in snow. The Hankooks on the Malibu (Factory) were better. 205/45/17 (If I remember correctly)
2015 Tucson SE AWD PZEV
2010 Yamaha Majesty