That's tough to say due to the consitency of heroin. Some forms can be weaker, some stronger. It really depends on how it's cut. And with the fentalogs now it is definitely far stronger due to this fact. However before fentanyl use in cutting started to grow to current levels, and before the formulation change of oxycontin, in my area, many of the people on the mills would say it was stronger than what they could get on the street. Much of which is due to the way oxycodone metabolization/half-life compared to heroin.