there are supply voltages and there are rated voltages. In this case, you are fine with what you have.
Your 220 volt outlet is actually 240 volts (supply) and the 250 volt plug is a rating and the 230 is also a rating. They are all intended for use with the 240 volt supply.
Your 220 volt outlet is actually 240 volts (supply) and the 250 volt plug is a rating and the 230 is also a rating. They are all intended for use with the 240 volt supply.