I fiddled with some quite a few years ago that came with a stabilization processor. the A was smooth, but not glossy- and thin. Think of typical photocopy paper, but maybe a bit thinner.

SC had incorporared developing agent. It just needed an alkaline solution to make it work. I processed it a solution of 20 mule team borax laudry booster after my stabilization processor activator solution reservoir ran dry. I am not sure what the second bottle of stuff did, but you did not have to fix the paper if you only wanted the print to last a few days, as many did when this process type was popular. For long lived prints you had to fix and wash them. Tricky considering how thin the base was.

I fear that the stuff you have may be fogged. A lot of integrated developer stuff goes bad a lot faster than traditionally coated material of a similar age.