Trying to tell the ores apart is quite difficult. Even if the exchange rate assumes a 2:1 ratio it would be great to have a recipe for converting the ingots between the systems (though even better would be if both systems just agreed they wanted a material of the same name and that it would be the same).
While converting blocks of metals might also be useful it would have to use a 2 block recipe since the block to ingot recipe already consumes the single block form. In any event it should be symmetrical if both are added so that there's one 'conversion' template that can be remembered by the end user.