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@Dammit
Grams is on the money here, and you're fine. The issue with mismatching tyre diameters is that they cause the tyres to rotate at different rates which a centre diff tyres to stop, as it sees it as slip, and then overheats and dies (if it does it for long enough). But as you have a FWD petrol/RWD electric car with a logical rather than physical connection between the two axles you could even go for a bit of rake, a-la jacked up Charger.