I don't know if it's true but a guide at the Athens museum told us that it is not possible to match sculptures like Venus de Milo or the Caryatids. I am not sur

I don't know if it's true but a guide at the Athens museum told us that it is not possible to match sculptures like Venus de Milo or the Caryatids. I am not sure why though. We are more advanced in everything now, but not in sculpture?