Good question. I think that in general it is a loose relationship and there seems to be no available information outside of what the breweries have access to. I have asked this question and it gets really rough when you start looking at the diastatic powers of foreign malts. The best thing to do is make sure you always have something that is high in a good percentage and there should always be sufficient dp to convert.
Event Horizon ~ A tribute to the miracle of fermentation.
Brew what you like. Do this, and you will find your inner brewer.