Audio Research 230/240 volts

I'm looking to buy a European SP16 Pre, on the back of the pre it has 230v stamped on it, I live in the UK where we use 240v. I have been told that the 230v models use the same transformers as for the 240v.
Does anyone know whether this is correct.
I know that the unit will work but I juat want to make sure the the performance will not be affected.
Am I okay to get the 230v model or best to get the 240v model?
Any prompt response would be greatly appreciated