judging from the different intensities and effects reported they should entail two main variations, one is the amount of alkaloids, some are stronger and some are weaker, the other is the ratio of alkaloids, some have harmine alone, some have it with THH and harmaline etc
some colors of caapi are known to cause more tremors and shaking than others, these are typically those used by shamans but are not those given by shamans to patients.