The Creature's core is the same shape as the Titan's. I think that core's been used in several balls. Possibly the densities have been tweaked or changed, but the shape is the same.
The Messenger's core is different. It's a lightbulb with a flip block.
As for the cover, I don't know if S40 is the same as any of the old Columbia resins like Superflex. AMF uses a "proven BASF resin" which is known to be Superflex, but I don't know if S40 is the same or not.
SH