There are not many chemicals active in the μg range, let alone when they are only present in traces. With psychedelics dose and unknown environmental and psych

There are not many chemicals active in the μg range, let alone when they are only present in traces. With psychedelics dose and unknown environmental and psychological factors can lead to different effect, so there is no need to speculate about a different chemical composition. I'd be careful when talking about 'different kinds of LSD' because while there are indeed various other Lysergamides that produce analogues effects, most of the time you are more likely to get something that is not LSD at all (e.g. NBOMe) when talking about 'different kinds' of LSD.