yes it will be taller because its the number written after the / is a percentage, meaning its 65% of whatever the patch width is, on a 195mm footprint tire the profile height is approximately 127mm, on a 205mm footprint tire the same 65% height becomes 133mm.
this height will throw out the calibration of your speedo and odometer also - so whatever fuel calculation your car is displaying would be wrong (just a secondary point to note).
It will also make the car handle like a bowl of jelly (not that prius has good handling in the first place - but whatever it has will become worse)