About 5 years ago I was testing the various models available for use in Blender and comparing them to the SL default avatar. Now Gaia of AvaStar has done that for you. Check it out.
I think it is really nice to have this information. But, there isn’t much use for it. Mesh clothes built based on the default avatar are simply never going to fit well. The sliders will always change the classic avatar and mesh clothes at different rates.
The classic avatar use morphing. Mesh clothes use rigging. Those two things respond differently.
However, the AvaStar model will get you as close to a match as is possible.