Ok, first, the caveats.... I 've always gathered with experienced folks present to back up my id so I am not as confident as I wish to be. And secondly, I will tell you what I think but I am not saying eat it.
Check with an expert or do the spore print to double check your id.
The dark ones look like chants to me. That is the distinctive white stem that looks sort like string cheese. The lighter may be an old one or a different species. I've heard there's more than one, but have only seen one for myself.