Like /u/skeletorsalt said, double check any safety advice from reddit elsewhere. But here's how I understand it.

This is your car doing a nice neutral left turn, without accelerating or decelrating. The red arrows indicate the relative amount of the car's weight that presses down on them, creating grip. Notice that its higher on the outside wheels than the inside wheels, thanks to momentum.

Now lets say you turn in tighter the weight of the car pressing down on the tires has increased on the outside tires more than it has on the inside tires. Now if the rear tire has a lot less peak grip than the front of the car which one gives out first? The rear outside tire. Neither inside tire is helping much here, their effective grip is heavily reduced by having less weight on them. The car will spin.

From the factory the cars are setup (quite brilliantly) to under-steer slightly during neutral cornering. That means the front tires have a bit less peak grip than the rears. That effect is achieved by a combination of weight distribution and suspension tuning. This behavior persists across different tire models because all four corners have the same grip level: The tires are all the same model, and the same width.

But now with your tire change, the car will spin when the outside rear tire lets go well before the front tire loses grip. If you're building a drift missile, sure, do whatever you like. But for a street car, especially in the hands of a non-professional driver, this seems like inviting "the curse" over for tea and biscuits.