You know, dark chocolate and white chocolate and a more similar cocoa butter percentage then you would think....in many cases dark chocolate will have more cocoa butter...you can look at the package and find out the percentage by dividing the grams of fat per serving with the total grams in a whole serving....
But if you don't want to it is ok because the fat levels are pretty close to the same...white chocolate I have seen between 27%-41% fat and dark chocolate I have seen 30-50% fat(cocoa butter that is).....
And actually the melting point in the chocolates is determined where the cocoa butter came from and what the trigliceride makeup is of the cocoa butter....so either way will be close to interchangeable in those regards but the "sweetness" will be different and the dairy content will be different....hope this isn't confusing....
Have a good one,
Robert
www.chocolateguild.com