You didn't include the wheel width and offset in your question. If you're contemplating one of the 19" wheels Porsche offers as an option on 718s, I'm sure there's no issue with regard to the wheel fitting. Otherwise the wheel width and offset specs become important.
For completeness, your speedometer will be off if the circumference of the new tire is different than the old, though it may not be a material amount.
For completeness, your speedometer will be off if the circumference of the new tire is different than the old, though it may not be a material amount.
