Seeds can be different, there are apart of the same genetics technically but they are all different phenotypes (different variations of the genetics from the mother plant if feminized, and dual genetics of the mother and father)
Imagine it like 2 people having 10 children, most likely all ten kids are going to look different, and act different, but they are still of the same genetics that make up their parents! The only exception are twins, but for plants those pretty rare seeing as instead of a plant only having 10 seeds it could have 100's.
Hope this kind of helps
If it looks like they are completely different plants then maybe the company made a mistake, but if its a creditable company i would doubt it!
The only identical genetics when it comes to cannabis plants are clones.
I could be wrong on this, but idk if clones work with auto flowers!