First, as Whiteroom assumed, I also highly doubt that it's out of a different mold. Take a look at the specs for the SS
and then for the DP Pro+
. At 186 lengths, exactly
the same geometries. At 176 I think it's safe to say, then, that they are the same as well (can't find a spec reference for the 176 SS offhand...).
As far as layup goes (determining stiffness), I think I may have been quick to jump to the conclusion of "softer". If anything, they're probably the same construction. Two sheets of titanal, probably of the same thickness. After several years doing business with the Western rep for Stockli, I've gotten enough of an impression of their layup style for Stormriders that I feel confident about making that assertion. And after having hand-flexed both the other day, they actually feel about the same per identical length. If anything, the DP+ might still be stiffer, but definitely not the other way around.
And as a somewhat related FYI to take into account, the Schmidts have been getting progressively softer over time. And I own and have skied both older models enough to back that up. The original black/gray 04/05 ski is the stiffest, and in my opinion the best so far. Very akin to a race-room Super Nobis or surfboard Legend Pro back before Dynastar removed the balls from that ski. The 05/06-07/08 yellow flames SS is slightly softer, most noticeably in the tip and mid-foot, slightly in the tail. Still a nice ski, but not as snappy or solid as the original. And with this third gen., just from a hand-flex I can feel more softening from the 2nd gen than from 1st to 2nd. Whether that change is good or bad from a skiing standpoint, I'll hold my tongue on.