I didn't realize you were talking about Amazing Embroidery. Marji answered much better.
Hi, AmericanGirl! As far as I know, the alphabets offered in packs on Amazing Embroidery would be the same as the individual letters offered. Just instead of having to download 26 times, you only have to download once for the whole pack. So, if you want to know dimensions, color changes, stitch count, etc., you could go to the individual letter offered and get that information. It would be the same as the letters given as a pack.
Amazing Embroidery is set up pretty much like Cute, but you don't have the different categories, everything is just page by page as it was added to the site. So, there might be some designs between letters of the alphabet. What I did personally was just start at the last page, and as I downloaded, sorted into folders. Requires a bit of jumping about, but so worth it, the designs are the same quality as Cute.
If I didn't really answer your question, let us know, maybe somebody else can do better, hee hee hee. Hugs, Marji