235/40R19 is 671mm tall
305/35R19 is 696mm tall
An inch difference in diameter is probably going to throw VDC into a wobbly.
Your current tyre diameter is within 4mm btw.
If these are "Corsa", they are a full R-Spec tyre and will either wear stupid fast OR heat-cycle out quickly and go out to lunch and lose grip (R-Spec's are only good for 20 to 30 heat cycles and then the rubber loses it ability to grip regardless of the thread remaining)
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