Are multiple card stock variations available in the same packs? I doubt it, because most of the sets like that were printed in different series, and by different printing houses. So pre-1974, all Topps packs were in series of about 80-100 cards each.
If you wanted to do a study, there are now a preponderance of wax pack ripping videos on YouTube like this:
https://www.youtube.com/watch?v=Z6bu-0N6IQg
Just search "Vintage Breaks" and the year and manufacturer to see if there are any videos of packs being broken. Some sets have hundreds of opened packs stored on the net. People that want to try and identify pack sequencing can also watch these videos and learn how they were packed. The company is opening up vintage packs daily on their YouTube or Facebook channel if you want to watch regularly. Although they've now branched out into very new cards as well, so it's not just vintage anymore.