No, this is not the same paper.
I am almost exclusively an HP Professional Satin user (best HP paper made IMHO) It is getting harder and harder to find this paper online. The last several rolls I bought from 3rd-party providers (albeit in 24", but the last roll only last month), but they all showed low stock.
I think this is one-part to do with the super-high price, and one part to do with some earlier quality control issues on a few batches around 2010-2011.
Leigh
zippski