yep my bad.......i said that wrong......i meant they produce very similar gains.....superdrol dry lean gains.....PP wetter gains....

the main difference is that PP is a touch more androgenic than SD

and yes they are two completely different compounds
PP- 2-ene (17a-Methyl-etioallocholan-2-ene-17b-ol)
SD- 2a-17a-dimethyl-5a-androst-3-one