Many pressed pills YES... do actually contain mdma and no other psychoactives. Some are less than 75 mg, some are more than 100 mg. To think that molllie and pressed pill mdma are two different drugs is pretty hilarious.
You never know how much mdma is in either without really expensive testing, as others have said.
If on average you needed to pop 3 pressed (mdma-only) pills to get where you wanted... then yes you will need on average 3 mollies to get where you want to be.
And I think its also pretty funny how people seem to think that NO pressed pills have only mdma or any mdma in them - they are simply different forms of the same thing. (maybe somebody else said that too - in that case, my 12 years of consuming mdma 2nds that notion)
I always have been able to tell (im not just popping a bunch of random pills to get "fucked up" and party on who cares wht it is like many unfortunately are) if there is ANY significant amount of ANY other psychoactives other than MDxx (which can't ALWAYS be told apart by non-idiots, but usually can, really) in my doses of suspected mdma. Misrepresentation has really only happened to me a small hand-full of times... but I am extremely careful - these unexpected experiences have always ruined my night in the past.
So bottom line, yes pressed pills (when they are not frauds) are exactly the same drug as mollie (when its not fraud)... and yes - there are mdma-only pressed pills out there!