Hey Showme,
Going to buy some more, I ran into similar confusions. After wandering around a bit, and looking here:
https://www.weldbond.com I now think it is likely all the same glue. I couldn't find references to numbers on the website, but they do seem to be talking about only one glue on the site. After clicking the different numbered bottles on amazon, I am thinking that the numbers might be indicators for different sized bottles. Also confusing, there are the old-look bottles, and the new-look bottle, and all the new ones don't look just alike, no red band on the actual label of the little one....but my guess now is they are the same glue.