it is likely that they are different mushrooms which is not a bad thing i do not believe they will fight because they are of the same species. i have also seen mushrooms of the same kind take 4 times as long to heal than others. some mushrooms also like to be in a different location then the brothers and sisters if it decides to move it will. in this case i would say they are different however i cannot tell you what the names are of this specific type but im sure someone on here can answer that for you... hope i could help at least a little bit. I def think you have 2 types in this picture which is great in my opinion