Does it matter to keep different set of tires for front and rear?

YOU CAN MAKE ALL THE SAME AS LONG AS THEY CLEAR THE WHEEL WELL AND DON'T HIT WHILE TURNING OR GOING IN AND OUT OF DRIVEWAYS

You should not change the tire size from the original. The tire placard on door pillar or glove/center box will tell you the correct tire size on your car. A reputable tire shop will also be able to tell you the correct tire size. If you change the size it will affect your speedometer, ABS, fuel economy, handling characteristics and braking distance. Please replace all four tires with the correct size.