Could be two different strains, or it could be the same strain and just two nugs from two different plants from the same grow... Who says each nug in your bag has to be from the same plant? We all know that its nearly impossible to identify strains by appearance because they can take on many different forms depending on growing conditions.

I like the mixed bags, myself (if its all quality). I'll also trade nugs with friends. Two types of killer weed is better than one!