It seems like it should be and I can't really think of a reason why it wouldn't but in my experience they seem different. When I've gotten low quality dope if I sniff a lot of it, I can still get pretty high. But the high always seems to wear off a lot more quickly than the high from high quality heroin. In fact, there have even been occasions where I prefer the low quality heroin if I can't afford to be high for a long period. Other than the duration, the effects seem pretty much the same although I'd say maybe the high quality heroin feels "cleaner" but that could be placebo. I am pretty sure the different duration of effect is not placebo though. So what makes this possible? Something to do with absorption? I sniff it.