Here is all the information I know,
I have 8 sets, two of the sets have three figures in them, one set has the papa, smurfette, and baby, the other set has two regular smurfs and brainy. Then I have 4 sets that have dressed up smurfs, those sets are circus, cleaning up, the choir, the musicians, seaside, workers. the smurfs themselves dont' seem to be different except for the outfits they are wearing, also it looks like the choir is in fact a back up band to the musicians as they have similar outfits on.
I will post a picture of the back of the box and show a close up where it says there is a smurfling box out there somewhere. I am uploading right now the pictures of the flocked set on my site, here is the link
http://www.kickingtheblues.com/figures.html
Let me know if there is a problem with the page, my uploading is goofing up today!
Oh and also these are copywritten in 1988.. so maybe they where discontinued before the smurflings could be brought out
gerda