well it could be many many things, microbes, soils, even what the trees around it are doing. Could be a different species. I dont know. Im not a mycologist.
All I know is, it would seem these fly agarics do not work on this continent.
AND if they did, I would expect everyone and their dog to know this and be tripping on them for free all the time. Not the case.
Look these up one the shroomery for better opinions and accounts.