Can fit since it is much narrower than original size. However, the tire sidewall will looked a bit stretched.

Maximum pressure permitted by tyre manufacturers are always embossed/printed on the external sidewall of any tyre.

Yours is likely 350 kpa MAXIMUM, which hasn't been breached with a 250kpa!

220kpa is the minimum tyre pressure recommended by your car manufacturer for its specific design load. This design load is well below that of a 250kpa load rating.

This is not over-inflation per se, as far as the tyre is concerned. 

I would say there is tyre over-pressure for the vehicle design load, which technically is harmless and NOT 'dangerous' as often expounded.

Internet has been confusing and misleading in interpreting 'tyre' Over Inflation and/or 'vehicle load' Over Inflation.