I don't think there was a PP version of the S25-CVA. Closest would be the PP S25AV, which has a different AV setup than an S25-CVA. Also has the full length clutch cover, a bar stud with nut (instead of the cap screw), and has different part numbers for the piston, cylinder, and rings.
I'm glad you couldnt remember because there is no Poulan Pro S25CVA. There is a Poulan Pro S25AV though and that is the one I just got. There is also a Poulan Pro S25
Edit
Aaron beat me to the enter key. LOL
Well, ain't I the dumbazz tonight......