All true European spruce is the same species: 'Carpathian' is something else, I think. At any rate, like all spruces, it varies depending on where it was grown and, more importantly, from tree to tree.
I've recently begun to measure the stiffness and density of all my top wood as it comes in. There's a _huge_ amount of variation. For example, most of my Englemann spruce tops have been on the light and soft side, but the latest batch has been as dense and stiff as any of the Red spruce I've tested. I have one western red cedar top that is an _exact_ match in most of its properties to a Red spruce one, the only difference being in the damping factor. In theory those two pieces of wood should be made the same thickness, braced the same, and yeild the same tap tones. We'll see if the two guitars sound the same!
Generally speaking, the lighter weight the top is for a given size guitar the louder it will be. Because the absolute stiffness of a piece of wood is proportional to the Young's modulus and the cube of the thickness, it turns out that density is much more important than Young's modulus in determining the weight of the top. So, for a light top you want a low density piece of wood with reasonable stiffness, and then you just leave it thick enough to work right.
In practice, you can get away with denser wood on steel strings than classicals. Greater density does seem to give more 'headroom', and the harder they get played the more benefit there is to using a dense wood. Thus, Red and Sitka, which are both relatively dense for spruces on average, work well for flat picking instruments, while the normally less dense Englemann and Euro seem to be the choices for fingerstyle and classical boxes. Cedar tends to be even less dense tha Englemann, usually. Again, these are _averages_; you really have to look at each piece of wood individually to be sure of what you're getting.
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but Lutz is Sitka hybrid with white spruce or Engelmann - depending on altitude - as Shane has told us in his "pictorial" posts some time back. It is fabulous wood and the closest N.American to Euro I have seen.
but I did think that Carpathian was a Picea abies