Tin is senses in all arts, pewter is strength in two of them, 4 physical and 4 mental in two as well, Nicrocil is always related to Investiture, and Aluminum is an inigma for them all.
There are a lot of commonalities, and a lot of differences, just as I excpect we will see as SA plays out.
I see where you are looking, but I think you have the wrong angle.