Serge,
How much "is a bit less".......?
Christ -
I don't have the old weight tallies at hand, but I think they were within 1/8 ounce of each other, when my old scale worked. They had the same thicknesses and structures, except for the carbon veil laminate on the lighter one. I just weighed the heavier one at 2 oz +/- 1/16 oz, but the other is part of a plane I've flown over the past four years and cannot be weighed.
Areas:
Lighter one (has carbon veil between laminations): 100.8 in
2Heavier one (no veil between): 104.5 in
2 (about 3.7% larger in area, W = 2 oz to nearest 1/8 oz)
So,...if they were built of identical materials, there would be about .07 oz difference in weights (close to but greater than 1/16 oz). This would be just enough to (perhaps) show up on the only scale I have available.