I don't know how to calculate amounts of caffeine but regarding the differing psychoactive effects, Googling 'tea stimulants' will get you lots of info... seems

I don't know how to calculate amounts of caffeine but regarding the differing psychoactive effects, Googling 'tea stimulants' will get you lots of info... seems the main other stimulants in tea besides caffeine are theobromine (as found in cacao/chocolate) and theophylline.