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There are different geometries with wound strings. Steel strings can vary about 30% or more in density, and thus different brands with different weights will require different tensions. This has been discussed in depth before, but I can post some data from the AIP handbook about the density of steel if you want.
The basic thing with steel is that it is a word that describes many very different metals, but most manufacturers use one of three kinds of steel.
The great thing about D'Addario is that they print the data right on the package, or you can download their string guide from their webpage. Other manufacturers do not post such information. Perhaps one of us could take an .009"plain, an .024"wound, and a .046"wound, cut them to a standard length without the ball ends or the taper, and weight them carefully (say analytical balance). Try with different brands and report the findings. It'd be really cool to have the density data for all of the big companies like Ernie Ball, GHS, and DR.
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